update to 47.0rc1firefox-47-beta

41 files changed, 1033 insertions, 450 deletions

diff --git a/arc-firefox-theme/chrome/browser/aboutNetError.css b/arc-firefox-theme/chrome/browser/aboutNetError.css
index 9f13d76..8c4a34f 100644
--- a/arc-firefox-theme/chrome/browser/aboutNetError.css
+++ b/arc-firefox-theme/chrome/browser/aboutNetError.css
@@ -33,6 +33,12 @@ ul {
   max-width: 512px;
 }
 
+#advancedPanelContainer {
+  position: absolute;
+  padding-bottom: 24px;
+  width: 100%;
+}
+
 #errorTitle {
   background: url("chrome://global/skin/icons/info.svg") left 0 no-repeat;
   background-size: 3em;
diff --git a/arc-firefox-theme/chrome/browser/browser.css b/arc-firefox-theme/chrome/browser/browser.css
index c874a40..3ef2f72 100644
--- a/arc-firefox-theme/chrome/browser/browser.css
+++ b/arc-firefox-theme/chrome/browser/browser.css
@@ -5,6 +5,7 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/* navbarInsetHighlight is tightly coupled to the toolbarHighlight constant. */
 :root {
   --toolbarbutton-hover-background: #fbfbfc;
   --toolbarbutton-hover-boxshadow: none;
@@ -427,9 +428,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-image-region: rect(0px 48px 16px 32px); }
 
 #subscribeToPageMenuitem:not([disabled]),
-#subscribeToPageMenupopup,
-#BMB_subscribeToPageMenuitem:not([disabled]),
-#BMB_subscribeToPageMenupopup {
+#subscribeToPageMenupopup {
   list-style-image: url("chrome://browser/skin/page-livemarks.png"); }
 
 #bookmarksToolbarFolderMenu,
@@ -640,7 +639,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
     list-style-image: url("chrome://browser/skin/custom_images/light/tabbar-icons.svg"); }
 
-#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
+#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
   list-style-image: url("chrome://browser/skin/custom_images/toolbar-icons-active.svg"); }
 
 #nav-bar #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker:not([disabled=true]):-moz-any([open], [checked], :hover:active) > .dropmarker-icon,
@@ -817,6 +816,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 1024px, 32px, 992px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(32px, 1024px, 64px, 992px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 416px, 32px, 384px); }
@@ -974,6 +976,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 2048px, 64px, 1984px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(64px, 2048px, 128px, 1984px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 832px, 64px, 768px); }
@@ -1166,7 +1171,10 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-appearance: toolbarbutton-dropdown;
   transition: opacity 0.15s ease; }
 
-#navigator-toolbox:not(:hover) .urlbar-history-dropmarker {
+#urlbar-wrapper[switchingtabs] > #urlbar > .urlbar-textbox-container > .urlbar-history-dropmarker {
+  transition: none; }
+
+#navigator-toolbox:not(:hover) #urlbar:not([focused]) > .urlbar-textbox-container > .urlbar-history-dropmarker {
   opacity: 0; }
 
 #urlbar-container {
@@ -1383,6 +1391,10 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   list-style-image: url(chrome://browser/skin/identity-mixed-active-blocked.svg);
   visibility: visible; }
 
+#urlbar[pageproxystate="valid"] > #identity-box.certUserOverridden > #connection-icon {
+  list-style-image: url(chrome://browser/skin/identity-mixed-passive-loaded.svg);
+  visibility: visible; }
+
 .popup-notification-icon {
   width: 64px;
   height: 64px;
@@ -1474,11 +1486,6 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   height: 16px;
   margin: 0 2px; }
 
-.identity-notification-icon,
-#identity-notification-icon {
-  list-style-image: url(chrome://mozapps/skin/profile/profileicon.png);
-  /* XXX: need HiDPI version */ }
-
 .geo-notification-icon,
 #geo-notification-icon {
   list-style-image: url(chrome://browser/skin/Geolocation-16.png); }
@@ -2800,6 +2807,20 @@ html|*#fullscreen-exit-button {
   box-shadow: none;
   border-bottom-width: 0; }
 
+.devtools-responsiveui-textinput {
+  -moz-appearance: none;
+  background: #333;
+  color: #fff;
+  border: 1px solid #111;
+  border-radius: 2px;
+  padding: 5px;
+  width: 200px;
+  margin: 0; }
+
+.devtools-responsiveui-textinput[attention] {
+  border-color: #38ace6;
+  background: rgba(56, 172, 230, 0.4); }
+
 .devtools-responsiveui-menulist,
 .devtools-responsiveui-toolbarbutton {
   -moz-appearance: none;
@@ -3047,15 +3068,15 @@ html|*#fullscreen-exit-button {
    We are copy/pasting variables from light-theme and dark-theme,
    since they aren't loaded in this context (within browser.css). */
 :root[devtoolstheme="light"] #developer-toolbar {
-  --gcli-background-color: #ebeced;
+  --gcli-background-color: #fcfcfc;
   /* --theme-tab-toolbar-background */
-  --gcli-input-background: #f0f1f2;
+  --gcli-input-background: #fcfcfc;
   /* --theme-toolbar-background */
-  --gcli-input-focused-background: #f7f7f7;
+  --gcli-input-focused-background: #ffffff;
   /* --theme-sidebar-background */
-  --gcli-input-color: #18191a;
+  --gcli-input-color: #393f4c;
   /* --theme-body-color */
-  --gcli-border-color: #aaaaaa;
+  --gcli-border-color: #dde1e4;
   /* --theme-splitter-color */
   --selection-background: #4c9ed9;
   /* --theme-selection-background */
@@ -3088,7 +3109,7 @@ html|*#fullscreen-exit-button {
 #developer-toolbar > toolbarbutton {
   -moz-appearance: none;
   border: none;
-  background: transparent;
+  background-color: transparent;
   margin: 0;
   padding: 0 10px;
   width: 32px; }
@@ -3096,15 +3117,18 @@ html|*#fullscreen-exit-button {
 .developer-toolbar-button > image {
   margin: auto 10px; }
 
-:root[devtoolstheme="light"] #developer-toolbar > toolbarbutton:not([checked=true]) > image,
+:root[devtoolstheme="light"] #developer-toolbar > .developer-toolbar-button:not([checked=true]) > image,
 :root[devtoolstheme="light"] .gclitoolbar-input-node:not([focused=true])::before {
   filter: invert(1); }
 
-.developer-toolbar-button > .toolbarbutton-icon,
-#developer-toolbar-closebutton > .toolbarbutton-icon {
+.developer-toolbar-button > .toolbarbutton-icon {
   width: 16px;
   height: 16px; }
 
+/* The toolkit close button is low contrast in the dark theme so invert it. */
+:root[devtoolstheme="dark"] #developer-toolbar > .close-icon:not(:hover) > image {
+  filter: invert(1); }
+
 #developer-toolbar-toolbox-button {
   list-style-image: url("chrome://devtools/skin/images/toggle-tools.png");
   -moz-image-region: rect(0px, 16px, 16px, 0px); }
@@ -3134,32 +3158,6 @@ html|*#fullscreen-exit-button {
 
   #developer-toolbar-toolbox-button[checked=true] {
     -moz-image-region: rect(0px, 128px, 32px, 96px); } }
-#developer-toolbar-closebutton {
-  list-style-image: url("chrome://devtools/skin/images/close.png");
-  -moz-appearance: none;
-  border: none;
-  margin: 0 4px;
-  min-width: 16px;
-  width: 16px;
-  opacity: 0.6; }
-
-@media (min-resolution: 1.1dppx) {
-  #developer-toolbar-closebutton {
-    list-style-image: url("chrome://devtools/skin/images/close@2x.png"); } }
-#developer-toolbar-closebutton > .toolbarbutton-icon {
-  /* XXX Buttons have padding in widget/ that we don't want here but can't override with good CSS, so we must
-     use evil CSS to give the impression of smaller content */
-  margin: -4px; }
-
-#developer-toolbar-closebutton > .toolbarbutton-text {
-  display: none; }
-
-#developer-toolbar-closebutton:hover {
-  opacity: 0.8; }
-
-#developer-toolbar-closebutton:hover:active {
-  opacity: 1; }
-
 /* GCLI */
 html|*#gcli-tooltip-frame,
 html|*#gcli-output-frame {
@@ -3308,6 +3306,9 @@ notification.pluginVulnerable {
 notification.pluginVulnerable .messageImage {
   list-style-image: url("chrome://browser/skin/notification-pluginBlocked.png"); }
 
+notification.pluginVulnerable > .notification-inner > .messageCloseButton:not(:hover) {
+  background-image: -moz-image-rect(url("chrome://global/skin/icons/close.svg"), 0, 80, 16, 64); }
+
 #notification-popup[popupid="login-fill"] > .panel-arrowcontainer > .panel-arrowcontent {
   /* Since we display a sliding subview that extends to the border, we cannot
    * keep the default padding of arrow panels. We use the same padding in the
diff --git a/arc-firefox-theme/chrome/browser/controlcenter/panel.css b/arc-firefox-theme/chrome/browser/controlcenter/panel.css
index 824c652..499da56 100644
--- a/arc-firefox-theme/chrome/browser/controlcenter/panel.css
+++ b/arc-firefox-theme/chrome/browser/controlcenter/panel.css
@@ -10,6 +10,7 @@
 
 /* Show the right elements for the right connection states. */
 #identity-popup[connection=not-secure] [when-connection~=not-secure],
+#identity-popup[connection=secure-cert-user-overridden] [when-connection~=secure-cert-user-overridden],
 #identity-popup[connection=secure-ev] [when-connection~=secure-ev],
 #identity-popup[connection=secure] [when-connection~=secure],
 #identity-popup[connection=chrome] [when-connection~=chrome],
@@ -81,15 +82,9 @@
 
 #identity-popup-multiView > .panel-viewcontainer > .panel-viewstack > .panel-subviews {
   background: var(--panel-arrowcontent-background);
-  border-bottom-right-radius: 3.5px;
   padding: 0;
 }
 
-#identity-popup-multiView > .panel-viewcontainer > .panel-viewstack > .panel-subviews:-moz-locale-dir(rtl) {
-  border-bottom-right-radius: 0;
-  border-bottom-left-radius: 3.5px;
-}
-
 .identity-popup-section:not(:first-child) {
   border-top: 1px solid var(--panel-separator-color);
 }
@@ -98,14 +93,19 @@
 #identity-popup-security-content,
 #identity-popup-permissions-content,
 #tracking-protection-content {
-  padding: 0.5em 0 1em;
-  -moz-padding-start: calc(2em + 24px);
-  -moz-padding-end: 1em;
   background-repeat: no-repeat;
   background-position: 1em 1em;
   background-size: 24px auto;
 }
 
+#identity-popup-security-content,
+#identity-popup-permissions-content,
+#tracking-protection-content {
+  padding: 0.5em 0 1em;
+  -moz-padding-start: calc(2em + 24px);
+  -moz-padding-end: 1em;
+}
+
 #identity-popup-securityView:-moz-locale-dir(rtl),
 #identity-popup-security-content:-moz-locale-dir(rtl),
 #identity-popup-permissions-content:-moz-locale-dir(rtl),
@@ -206,7 +206,6 @@
 }
 
 #identity-popup-securityView {
-  padding-bottom: 2em;
   overflow: hidden;
 }
 
@@ -233,6 +232,11 @@
   background-image: url(chrome://browser/skin/controlcenter/conn-degraded.svg);
 }
 
+#identity-popup[connection=secure-cert-user-overridden] #identity-popup-securityView,
+#identity-popup[connection=secure-cert-user-overridden] #identity-popup-security-content {
+  background-image: url(chrome://browser/skin/identity-mixed-passive-loaded.svg);
+}
+
 #identity-popup[loginforms=insecure] #identity-popup-securityView,
 #identity-popup[loginforms=insecure] #identity-popup-security-content,
 #identity-popup[mixedcontent~=active-loaded][isbroken] #identity-popup-securityView,
@@ -245,7 +249,14 @@
   color: Graytext;
 }
 
+#identity-popup-securityView-header,
+#identity-popup-securityView-body {
+  -moz-margin-start: calc(2em + 24px);
+  -moz-margin-end: 1em;
+}
+
 #identity-popup-securityView-header {
+  margin-top: 0.5em;
   border-bottom: 1px solid var(--panel-separator-color);
   padding-bottom: 1em;
 }
@@ -254,6 +265,30 @@
   -moz-padding-end: 1em;
 }
 
+#identity-popup-securityView-footer {
+  margin-top: 1em;
+  background-color: hsla(210,4%,10%,.07);
+}
+
+#identity-popup-securityView-footer > button {
+  -moz-appearance: none;
+  margin: 0;
+  border: none;
+  border-top: 1px solid #ccc;
+  padding: 8px 20px;
+  color: ButtonText;
+  background-color: transparent;
+}
+
+#identity-popup-securityView-footer > button:hover,
+#identity-popup-securityView-footer > button:focus {
+  background-color: hsla(210,4%,10%,.07);
+}
+
+#identity-popup-securityView-footer > button:hover:active {
+  background-color: hsla(210,4%,10%,.12);
+}
+
 #identity-popup-content-verifier ~ description {
   margin-top: 1em;
   color: Graytext;
diff --git a/arc-firefox-theme/chrome/browser/customizableui/panelUIOverlay.css b/arc-firefox-theme/chrome/browser/customizableui/panelUIOverlay.css
index 6104135..eb91c9b 100644
--- a/arc-firefox-theme/chrome/browser/customizableui/panelUIOverlay.css
+++ b/arc-firefox-theme/chrome/browser/customizableui/panelUIOverlay.css
@@ -201,8 +201,8 @@ panelmultiview[nosubviews=true] > .panel-viewcontainer > .panel-viewstack > .pan
 
 .panelUI-grid .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-multiline-text,
 .panelUI-grid .toolbarbutton-1 > .toolbarbutton-multiline-text {
-  line-height: 1.1;
-  max-height: 2.2em;
+  line-height: 1.2;
+  max-height: 2.4em;
 }
 
 .panelUI-grid .toolbarbutton-1:not([auto-hyphens="off"]) > .toolbarbutton-menubutton-button > .toolbarbutton-multiline-text,
@@ -213,7 +213,7 @@ panelmultiview[nosubviews=true] > .panel-viewcontainer > .panel-viewstack > .pan
 .panelUI-grid:not([customize-transitioning]) .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-multiline-text,
 .panelUI-grid:not([customize-transitioning]) .toolbarbutton-1 > .toolbarbutton-multiline-text {
   position: absolute;
-  clip: rect(auto, auto, 2.3em, auto);
+  clip: rect(-0.1em, auto, 2.6em, auto);
 }
 
 .panelUI-grid .toolbarbutton-1 > .toolbarbutton-text,
@@ -678,7 +678,9 @@ toolbarpaletteitem[place="palette"] > toolbaritem > toolbarbutton {
 .PanelUI-remotetabs-prefs-button {
   -moz-appearance: none;
   background-color: #0096dd;
-  color: white;
+  /* !important for the color as an OSX specific rule when a lightweight theme
+     is used for buttons in the toolbox overrides. See bug 1238531 for details */
+  color: white !important;
   border-radius: 2px;
   margin-top: 10px;
   margin-bottom: 10px;
diff --git a/arc-firefox-theme/chrome/browser/devedition.css b/arc-firefox-theme/chrome/browser/devedition.css
index d1ad023..6596a11 100644
--- a/arc-firefox-theme/chrome/browser/devedition.css
+++ b/arc-firefox-theme/chrome/browser/devedition.css
@@ -73,7 +73,7 @@
   --chrome-secondary-background-color: #f5f6f7;
   --chrome-navigator-toolbox-separator-color: #cccccc;
   --chrome-nav-bar-separator-color: #B6B6B8;
-  --chrome-nav-buttons-background: #fcfcfc;
+  --chrome-nav-buttons-background: #ffffff; /* --theme-body-background */
   --chrome-nav-buttons-hover-background: #DADBDB;
   --chrome-nav-bar-controls-border-color: #ccc;
   --chrome-selection-color: #f5f7fa;
@@ -83,9 +83,7 @@
   --tab-hover-background-color: #D7D8DA;
   --tab-selection-color: #f5f7fa;
   --tab-selection-background-color: #4c9ed9;
-  --tab-selection-box-shadow: 0 2px 0 #9FDFFF inset,
-                              0 -2px 0 rgba(0,0,0,.05) inset,
-                              0 -1px 0 rgba(0,0,0,.2) inset;
+  --tab-selection-box-shadow: none;
   --pinned-tab-glow: radial-gradient(22px at center calc(100% - 2px), rgba(76,158,217,0.9) 13%, transparent 16%);
 
 
diff --git a/arc-firefox-theme/chrome/browser/downloads/allDownloadsViewOverlay.css b/arc-firefox-theme/chrome/browser/downloads/allDownloadsViewOverlay.css
index 473e401..9935e0f 100644
--- a/arc-firefox-theme/chrome/browser/downloads/allDownloadsViewOverlay.css
+++ b/arc-firefox-theme/chrome/browser/downloads/allDownloadsViewOverlay.css
@@ -1,6 +1,14 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+
+/*** View and outer controls ***/
 
 #downloadsRichListBox {
   /** The default listbox appearance comes with an unwanted margin. **/
@@ -8,20 +16,25 @@
   margin: 0;
 }
 
+/*** List items ***/
+
+#downloadsRichListBox > richlistitem.download {
+  height: var(--downloads-item-height);
+}
+
 #downloadsRichListBox > richlistitem.download {
-  height: 5em;
   padding: 5px 8px;
 }
 
 .downloadTypeIcon {
   -moz-margin-end: 8px;
-  /* Prevent flickering when changing states. */
-  min-height: 32px;
-  min-width: 32px;
+  width: 32px;
+  height: 32px;
 }
 
+
 .blockedIcon {
-  list-style-image: url("moz-icon://stock/gtk-dialog-error?size=dialog");
+  list-style-image: url("chrome://global/skin/icons/Error.png");
 }
 
 .downloadTarget {
@@ -46,88 +59,97 @@
   list-style-image: url("chrome://browser/skin/downloads/buttons.png");
 }
 
+/*** List items ***/
+
+:root {
+  --downloads-item-height: 5em;
+}
+
+.blockedIcon {
+  list-style-image: url("moz-icon://stock/gtk-dialog-error?size=dialog");
+}
+
 /*** Button icons ***/
 
 .downloadButton.downloadConfirmBlock,
 .downloadButton.downloadCancel {
   -moz-image-region: rect(0px, 16px, 16px, 0px);
 }
-richlistitem.download:hover > .downloadButton.downloadConfirmBlock,
-richlistitem.download:hover > .downloadButton.downloadCancel {
+richlistitem.download:hover .downloadButton.downloadConfirmBlock,
+richlistitem.download:hover .downloadButton.downloadCancel {
   -moz-image-region: rect(0px, 32px, 16px, 16px);
 }
-richlistitem.download:hover > .downloadButton.downloadConfirmBlock:hover,
-richlistitem.download:hover > .downloadButton.downloadCancel:hover {
+richlistitem.download:hover .downloadButton.downloadConfirmBlock:hover,
+richlistitem.download:hover .downloadButton.downloadCancel:hover {
   -moz-image-region: rect(0px, 48px, 16px, 32px);
 }
-richlistitem.download:hover > .downloadButton.downloadConfirmBlock:active,
-richlistitem.download:hover > .downloadButton.downloadCancel:active {
+richlistitem.download:hover .downloadButton.downloadConfirmBlock:active,
+richlistitem.download:hover .downloadButton.downloadCancel:active {
   -moz-image-region: rect(0px, 64px, 16px, 48px);
 }
-richlistitem.download[selected] > .downloadButton.downloadConfirmBlock,
-richlistitem.download[selected] > .downloadButton.downloadCancel {
+richlistitem.download[selected] .downloadButton.downloadConfirmBlock,
+richlistitem.download[selected] .downloadButton.downloadCancel {
   -moz-image-region: rect(0px, 80px, 16px, 64px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadConfirmBlock,
-richlistitem.download:hover[selected] > .downloadButton.downloadCancel {
+richlistitem.download[selected]:hover .downloadButton.downloadConfirmBlock,
+richlistitem.download[selected]:hover .downloadButton.downloadCancel {
   -moz-image-region: rect(0px, 96px, 16px, 80px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadConfirmBlock:hover,
-richlistitem.download:hover[selected] > .downloadButton.downloadCancel:hover {
+richlistitem.download[selected]:hover .downloadButton.downloadConfirmBlock:hover,
+richlistitem.download[selected]:hover .downloadButton.downloadCancel:hover {
   -moz-image-region: rect(0px, 112px, 16px, 96px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadConfirmBlock:active,
-richlistitem.download:hover[selected] > .downloadButton.downloadCancel:active {
+richlistitem.download[selected]:hover .downloadButton.downloadConfirmBlock:active,
+richlistitem.download[selected]:hover .downloadButton.downloadCancel:active {
   -moz-image-region: rect(0px, 128px, 16px, 112px);
 }
 
 .downloadButton.downloadShow {
   -moz-image-region: rect(16px, 16px, 32px, 0px);
 }
-richlistitem.download:hover > .downloadButton.downloadShow {
+richlistitem.download:hover .downloadButton.downloadShow {
   -moz-image-region: rect(16px, 32px, 32px, 16px);
 }
-richlistitem.download:hover > .downloadButton.downloadShow:hover {
+richlistitem.download:hover .downloadButton.downloadShow:hover {
   -moz-image-region: rect(16px, 48px, 32px, 32px);
 }
-richlistitem.download:hover > .downloadButton.downloadShow:active {
+richlistitem.download:hover .downloadButton.downloadShow:active {
   -moz-image-region: rect(16px, 64px, 32px, 48px);
 }
-richlistitem.download[selected] > .downloadButton.downloadShow {
+richlistitem.download[selected] .downloadButton.downloadShow {
   -moz-image-region: rect(16px, 80px, 32px, 64px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadShow {
+richlistitem.download[selected]:hover .downloadButton.downloadShow {
   -moz-image-region: rect(16px, 96px, 32px, 80px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadShow:hover {
+richlistitem.download[selected]:hover .downloadButton.downloadShow:hover {
   -moz-image-region: rect(16px, 112px, 32px, 96px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadShow:active {
+richlistitem.download[selected]:hover .downloadButton.downloadShow:active {
   -moz-image-region: rect(16px, 128px, 32px, 112px);
 }
 
 .downloadButton.downloadRetry {
   -moz-image-region: rect(32px, 16px, 48px, 0px);
 }
-richlistitem.download:hover > .downloadButton.downloadRetry {
+richlistitem.download:hover .downloadButton.downloadRetry {
   -moz-image-region: rect(32px, 32px, 48px, 16px);
 }
-richlistitem.download:hover > .downloadButton.downloadRetry:hover {
+richlistitem.download:hover .downloadButton.downloadRetry:hover {
   -moz-image-region: rect(32px, 48px, 48px, 32px);
 }
-richlistitem.download:hover > .downloadButton.downloadRetry:active {
+richlistitem.download:hover .downloadButton.downloadRetry:active {
   -moz-image-region: rect(32px, 64px, 48px, 48px);
 }
-richlistitem.download[selected] > .downloadButton.downloadRetry {
+richlistitem.download[selected] .downloadButton.downloadRetry {
   -moz-image-region: rect(32px, 80px, 48px, 64px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadRetry {
+richlistitem.download[selected]:hover .downloadButton.downloadRetry {
   -moz-image-region: rect(32px, 96px, 48px, 80px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadRetry:hover {
+richlistitem.download[selected]:hover .downloadButton.downloadRetry:hover {
   -moz-image-region: rect(32px, 112px, 48px, 96px);
 }
-richlistitem.download:hover[selected] > .downloadButton.downloadRetry:active {
+richlistitem.download[selected]:hover .downloadButton.downloadRetry:active {
   -moz-image-region: rect(32px, 128px, 48px, 112px);
 }
-
diff --git a/arc-firefox-theme/chrome/browser/downloads/downloads.css b/arc-firefox-theme/chrome/browser/downloads/downloads.css
index 78c2f42..487d8f4 100644
--- a/arc-firefox-theme/chrome/browser/downloads/downloads.css
+++ b/arc-firefox-theme/chrome/browser/downloads/downloads.css
@@ -1,6 +1,12 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
 
 /*** Panel and outer controls ***/
 
@@ -27,57 +33,43 @@
   max-width: 40ch;
 }
 
-#downloadsHistory {
-  background: transparent;
-  color: -moz-nativehyperlinktext;
+#downloadsSummary {
+  padding: 8px 38px 8px 12px;
   cursor: pointer;
+  -moz-user-focus: normal;
 }
 
-#downloadsFooter {
-  border-top: 1px solid ThreeDShadow;
-  background-image: linear-gradient(hsla(0,0%,0%,.15), hsla(0,0%,0%,.08) 6px);
-}
-
-#downloadsHistory > .button-box {
-  margin: 1em;
-}
-
-#downloadsPanel[keyfocus] > #downloadsFooter > #downloadsHistory:focus > .button-box {
-  outline: 1px -moz-dialogtext dotted;
+#downloadsSummary > .downloadTypeIcon {
+  list-style-image: url("chrome://browser/skin/downloads/download-summary.png");
 }
 
-/*** Downloads Summary and List items ***/
 
-#downloadsSummary,
-richlistitem[type="download"] {
-  height: 6em;
-  -moz-padding-end: 0;
-  color: inherit;
+#downloadsSummaryDescription {
+  color: -moz-nativehyperlinktext;
 }
 
-#downloadsSummary {
-  padding: 8px 38px 8px 12px;
+#downloadsHistory {
+  background: transparent;
   cursor: pointer;
-  -moz-user-focus: normal;
 }
 
-#downloadsPanel[keyfocus] > #downloadsFooter > #downloadsSummary:focus {
-  outline: 1px -moz-dialogtext dotted;
-  outline-offset: -5px;
+#downloadsHistory > .button-box {
+  margin: 1em;
 }
 
-#downloadsSummary > .downloadTypeIcon {
-  list-style-image: url("chrome://browser/skin/downloads/download-summary.png");
-}
+/*** List items and similar elements in the summary ***/
 
-#downloadsSummaryDescription {
-  color: -moz-nativehyperlinktext;
+#downloadsSummary,
+richlistitem[type="download"] {
+  height: var(--downloads-item-height);
+  -moz-padding-end: 0;
+  color: inherit;
 }
 
 richlistitem[type="download"] {
   margin: 0;
-  border-top: 1px solid hsla(0,0%,100%,.2);
-  border-bottom: 1px solid hsla(0,0%,0%,.15);
+  border-top: 1px solid var(--downloads-item-border-top-color);
+  border-bottom: 1px solid var(--downloads-item-border-bottom-color);
   background: transparent;
   padding: 8px;
 }
@@ -90,25 +82,20 @@ richlistitem[type="download"]:last-child {
   border-bottom: 1px solid transparent;
 }
 
-#downloadsPanel[keyfocus] > #downloadsListBox:focus > richlistitem[type="download"][selected] {
-  outline: 1px -moz-dialogtext dotted;
-  outline-offset: -1px;
-}
-
 .downloadTypeIcon {
   -moz-margin-end: 8px;
   /* Prevent flickering when changing states. */
-  min-height: 32px;
-  min-width: 32px;
+  height: 32px;
+  width: 32px;
 }
 
 .blockedIcon {
-  list-style-image: url("moz-icon://stock/gtk-dialog-error?size=dialog");
+  list-style-image: url("chrome://global/skin/icons/Error.png");
 }
 
 /* We hold .downloadTarget, .downloadProgress and .downloadDetails inside of
    a vbox with class .downloadContainer. We set the font-size of the entire
-   container to 90% because:
+   container to --downloads-item-font-size-factor because:
 
    1) This is the size that we want .downloadDetails to be
    2) The container's width is set by localizers by &downloadDetails.width;,
@@ -120,26 +107,25 @@ richlistitem[type="download"]:last-child {
    font-size of .downloadContainer's parent, we use calc to go from the
    smaller font-size back to the original font-size.
  */
-
 #downloadsSummaryDetails,
 .downloadContainer {
-  font-size: 90%;
+  font-size: calc(100% * var(--downloads-item-font-size-factor));
 }
 
 #downloadsSummaryDescription,
 .downloadTarget {
-  margin-bottom: 7px;
+  margin-bottom: var(--downloads-item-target-margin-bottom);
   cursor: inherit;
 }
 
 .downloadTarget {
-  font-size: calc(100%/0.9);
+  font-size: calc(100% / var(--downloads-item-font-size-factor));
 }
 
 #downloadsSummaryDetails,
 .downloadDetails {
-  margin-top: 1px;
-  opacity: 0.6;
+  margin-top: var(--downloads-item-details-margin-top);
+  opacity: var(--downloads-item-details-opacity);
   cursor: inherit;
 }
 
@@ -158,13 +144,54 @@ richlistitem[type="download"]:last-child {
   padding: 0;
 }
 
+/*** Panel and outer controls ***/
+
+#downloadsFooter {
+  border-top: 1px solid ThreeDShadow;
+  background-image: linear-gradient(hsla(0,0%,0%,.15), hsla(0,0%,0%,.08) 6px);
+}
+
+#downloadsHistory {
+  color: -moz-nativehyperlinktext;
+}
+
+#downloadsPanel[keyfocus] #downloadsSummary:focus,
+#downloadsPanel[keyfocus] #downloadsHistory:focus > .button-box {
+  outline: 1px -moz-dialogtext dotted;
+}
+
+#downloadsPanel[keyfocus] #downloadsSummary:focus {
+  outline-offset: -5px;
+}
+
+/*** List items and similar elements in the summary ***/
+
+:root {
+  --downloads-item-height: 6em;
+  --downloads-item-border-top-color: hsla(0,0%,100%,.2);
+  --downloads-item-border-bottom-color: hsla(0,0%,0%,.15);
+  --downloads-item-font-size-factor: 0.9;
+  --downloads-item-target-margin-bottom: 7px;
+  --downloads-item-details-margin-top: 1px;
+  --downloads-item-details-opacity: 0.6;
+}
+
+.blockedIcon {
+  list-style-image: url("moz-icon://stock/gtk-dialog-error?size=dialog");
+}
+
 .downloadButton:focus > .button-box {
   outline: 1px -moz-dialogtext dotted;
 }
 
 /*** Highlighted list items ***/
 
-#downloadsPanel:not([keyfocus]) > #downloadsListBox > richlistitem[type="download"][state="1"][exists]:hover {
+#downloadsPanel[keyfocus] #downloadsListBox:focus > richlistitem[type="download"][selected] {
+  outline: 1px -moz-dialogtext dotted;
+  outline-offset: -1px;
+}
+
+#downloadsPanel:not([keyfocus]) richlistitem[type="download"][state="1"][exists]:hover {
   border-radius: 3px;
   border-top: 1px solid hsla(0,0%,100%,.3);
   border-bottom: 1px solid hsla(0,0%,0%,.2);
@@ -180,41 +207,41 @@ richlistitem[type="download"]:last-child {
 .downloadButton.downloadCancel {
   -moz-image-region: rect(0px, 16px, 16px, 0px);
 }
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadConfirmBlock,
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadCancel {
+richlistitem[type="download"]:hover .downloadButton.downloadConfirmBlock,
+richlistitem[type="download"]:hover .downloadButton.downloadCancel {
   -moz-image-region: rect(0px, 32px, 16px, 16px);
 }
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadConfirmBlock:hover,
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadCancel:hover {
+richlistitem[type="download"]:hover .downloadButton.downloadConfirmBlock:hover,
+richlistitem[type="download"]:hover .downloadButton.downloadCancel:hover {
   -moz-image-region: rect(0px, 48px, 16px, 32px);
 }
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadConfirmBlock:active,
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadCancel:active {
+richlistitem[type="download"]:hover .downloadButton.downloadConfirmBlock:active,
+richlistitem[type="download"]:hover .downloadButton.downloadCancel:active {
   -moz-image-region: rect(0px, 64px, 16px, 48px);
 }
 
 .downloadButton.downloadShow {
   -moz-image-region: rect(16px, 16px, 32px, 0px);
 }
-#downloadsPanel:not([keyfocus]) > #downloadsListBox > richlistitem[type="download"][state="1"]:hover > stack > .downloadButton.downloadShow {
+#downloadsPanel:not([keyfocus]) richlistitem[type="download"][state="1"]:hover .downloadButton.downloadShow {
   -moz-image-region: rect(16px, 96px, 32px, 80px);
 }
-#downloadsPanel:not([keyfocus]) > #downloadsListBox > richlistitem[type="download"][state="1"]:hover > stack > .downloadButton.downloadShow:hover {
+#downloadsPanel:not([keyfocus]) richlistitem[type="download"][state="1"]:hover .downloadButton.downloadShow:hover {
   -moz-image-region: rect(16px, 112px, 32px, 96px);
 }
-#downloadsPanel:not([keyfocus]) > #downloadsListBox > richlistitem[type="download"][state="1"]:hover > stack > .downloadButton.downloadShow:active {
+#downloadsPanel:not([keyfocus]) richlistitem[type="download"][state="1"]:hover .downloadButton.downloadShow:active {
   -moz-image-region: rect(16px, 128px, 32px, 112px);
 }
 
 .downloadButton.downloadRetry {
   -moz-image-region: rect(32px, 16px, 48px, 0px);
 }
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadRetry {
+richlistitem[type="download"]:hover .downloadButton.downloadRetry {
   -moz-image-region: rect(32px, 32px, 48px, 16px);
 }
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadRetry:hover {
+richlistitem[type="download"]:hover .downloadButton.downloadRetry:hover {
   -moz-image-region: rect(32px, 48px, 48px, 32px);
 }
-richlistitem[type="download"]:hover > stack > .downloadButton.downloadRetry:active {
+richlistitem[type="download"]:hover .downloadButton.downloadRetry:active {
   -moz-image-region: rect(32px, 64px, 48px, 48px);
 }
diff --git a/arc-firefox-theme/chrome/browser/fxa/android.png b/arc-firefox-theme/chrome/browser/fxa/android.png
index b014c42..e0a37a8 100644
--- a/arc-firefox-theme/chrome/browser/fxa/android.png
+++ b/arc-firefox-theme/chrome/browser/fxa/android.png
diff --git a/arc-firefox-theme/chrome/browser/fxa/android@2x.png b/arc-firefox-theme/chrome/browser/fxa/android@2x.png
index bbd602f..bb6bab5 100644
--- a/arc-firefox-theme/chrome/browser/fxa/android@2x.png
+++ b/arc-firefox-theme/chrome/browser/fxa/android@2x.png
diff --git a/arc-firefox-theme/chrome/browser/fxa/ios.png b/arc-firefox-theme/chrome/browser/fxa/ios.png
new file mode 100644
index 0000000..40c90b1
--- /dev/null
+++ b/arc-firefox-theme/chrome/browser/fxa/ios.png
diff --git a/arc-firefox-theme/chrome/browser/fxa/ios@2x.png b/arc-firefox-theme/chrome/browser/fxa/ios@2x.png
new file mode 100644
index 0000000..af2d5ac
--- /dev/null
+++ b/arc-firefox-theme/chrome/browser/fxa/ios@2x.png
diff --git a/arc-firefox-theme/chrome/browser/menuPanel.png b/arc-firefox-theme/chrome/browser/menuPanel.png
index f8c7f88..036e2a1 100644
--- a/arc-firefox-theme/chrome/browser/menuPanel.png
+++ b/arc-firefox-theme/chrome/browser/menuPanel.png
diff --git a/arc-firefox-theme/chrome/browser/menuPanel@2x.png b/arc-firefox-theme/chrome/browser/menuPanel@2x.png
index 28176a1..093bfea 100644
--- a/arc-firefox-theme/chrome/browser/menuPanel@2x.png
+++ b/arc-firefox-theme/chrome/browser/menuPanel@2x.png
diff --git a/arc-firefox-theme/chrome/browser/preferences/in-content/preferences.css b/arc-firefox-theme/chrome/browser/preferences/in-content/preferences.css
index 756fe31..dbedc83 100644
--- a/arc-firefox-theme/chrome/browser/preferences/in-content/preferences.css
+++ b/arc-firefox-theme/chrome/browser/preferences/in-content/preferences.css
@@ -562,7 +562,8 @@ description > html|a {
 }
 
 .fxaMobilePromo {
-  margin-bottom: 31px;
+  margin-bottom: 20px;
+  margin-top: 25px;
 }
 
 #fxaLoginRejectedWarning {
@@ -575,9 +576,22 @@ description > html|a {
   margin-bottom: 27.5px;
 }
 
+.androidLink {
+  background-image: url("chrome://browser/skin/fxa/android.png");
+}
+
+.iOSLink {
+  background-image: url("chrome://browser/skin/fxa/ios.png");
+}
+
 .androidLink,
 .iOSLink {
-  margin: 0;
+  margin: 0 0 0 2px;
+  padding-left: 28px;
+  padding-top: 6px;
+  height: 28px;
+  background-repeat: no-repeat;
+  background-size: 24px 28px;
 }
 
 #tosPP-small {
@@ -586,6 +600,12 @@ description > html|a {
 }
 
 @media (min-resolution: 1.1dppx) {
+  .androidLink {
+    background-image: url("chrome://browser/skin/fxa/android@2x.png");
+  }
+  .iOSLink {
+    background-image: url("chrome://browser/skin/fxa/ios@2x.png");
+  }
   .fxaSyncIllustration {
     list-style-image: url(chrome://browser/skin/fxa/sync-illustration@2x.png)
   }
@@ -618,6 +638,10 @@ description > html|a {
   margin-top: 2px !important;
 }
 
+#fxaProfileImage {
+  -moz-user-focus: normal;
+}
+
 menulist.actionsMenu > .menulist-dropmarker {
   margin-top: 11px;
   margin-bottom: 11px;
diff --git a/arc-firefox-theme/chrome/browser/sass/_browser-sass.scss b/arc-firefox-theme/chrome/browser/sass/_browser-sass.scss
index 621d47b..8e6bd9a 100644
--- a/arc-firefox-theme/chrome/browser/sass/_browser-sass.scss
+++ b/arc-firefox-theme/chrome/browser/sass/_browser-sass.scss
@@ -18,6 +18,7 @@ $darker_asset_path_2: if($darker=='true', 'dark', $asset_path);
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 
+/* navbarInsetHighlight is tightly coupled to the toolbarHighlight constant. */
 
 
 :root {
@@ -539,9 +540,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
 }
 
 #subscribeToPageMenuitem:not([disabled]),
-#subscribeToPageMenupopup,
-#BMB_subscribeToPageMenuitem:not([disabled]),
-#BMB_subscribeToPageMenupopup {
+#subscribeToPageMenupopup {
   list-style-image: url("chrome://browser/skin/page-livemarks.png");
 }
 
@@ -855,7 +854,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
 }
 
 
-#back-button, #back-button, #forward-button, #home-button, #print-button, #downloads-button, #new-tab-button, #new-window-button, #fullscreen-button, #sync-button, #feed-button, #social-share-button, #open-file-button, #find-button, #developer-button, #preferences-button, #privatebrowsing-button, #save-page-button, #add-ons-button, #history-panelmenu, #nav-bar-overflow-button, #PanelUI-menu-button, #characterencoding-button, #email-link-button, #sidebar-button, #zoom-out-button, #zoom-reset-button, #zoom-in-button, #cut-button, #copy-button, #paste-button, #e10s-button, #panic-button, #webide-button {
+#back-button, #forward-button, #home-button, #print-button, #downloads-button, #new-tab-button, #new-window-button, #fullscreen-button, #sync-button, #feed-button, #social-share-button, #open-file-button, #find-button, #developer-button, #preferences-button, #privatebrowsing-button, #save-page-button, #add-ons-button, #history-panelmenu, #nav-bar-overflow-button, #PanelUI-menu-button, #characterencoding-button, #email-link-button, #sidebar-button, #zoom-out-button, #zoom-reset-button, #zoom-in-button, #cut-button, #copy-button, #paste-button, #e10s-button, #panic-button, #webide-button {
 
   #nav-bar &:not([disabled=true]):-moz-any([open],[checked],:hover:active),
   #TabsToolbar &:not([disabled=true]):-moz-any([open],[checked],:hover:active) {
@@ -1098,6 +1097,10 @@ list-style-image: url("chrome://browser/skin/custom_images/toolbar-icons-active.
     -moz-image-region: rect(0px, 1024px, 32px, 992px);
   }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(32px, 1024px, 64px, 992px);
+  }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 416px, 32px, 384px);
@@ -1298,6 +1301,10 @@ list-style-image: url("chrome://browser/skin/custom_images/toolbar-icons-active.
     -moz-image-region: rect(0px, 2048px, 64px, 1984px);
   }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(64px, 2048px, 128px, 1984px);
+  }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 832px, 64px, 768px);
@@ -1530,7 +1537,11 @@ list-style-image: url("chrome://browser/skin/custom_images/toolbar-icons-active.
   transition: opacity 0.15s ease;
 }
 
-#navigator-toolbox:not(:hover) .urlbar-history-dropmarker {
+#urlbar-wrapper[switchingtabs] > #urlbar > .urlbar-textbox-container > .urlbar-history-dropmarker {
+  transition: none;
+}
+
+#navigator-toolbox:not(:hover) #urlbar:not([focused]) > .urlbar-textbox-container > .urlbar-history-dropmarker {
   opacity: 0;
 }
 
@@ -1871,6 +1882,11 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   visibility: visible;
 }
 
+#urlbar[pageproxystate="valid"] > #identity-box.certUserOverridden > #connection-icon {
+  list-style-image: url(chrome://browser/skin/identity-mixed-passive-loaded.svg);
+  visibility: visible;
+}
+
 
 .popup-notification-icon {
   width: 64px;
@@ -1993,12 +2009,6 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   margin: 0 2px;
 }
 
-.identity-notification-icon,
-#identity-notification-icon {
-  list-style-image: url(chrome://mozapps/skin/profile/profileicon.png);
-  /* XXX: need HiDPI version */
-}
-
 .geo-notification-icon,
 #geo-notification-icon {
   list-style-image: url(chrome://browser/skin/Geolocation-16.png);
@@ -3745,6 +3755,22 @@ html|*#fullscreen-exit-button {
   border-bottom-width: 0;
 }
 
+.devtools-responsiveui-textinput {
+  -moz-appearance: none;
+  background: #333;
+  color: #fff;
+  border: 1px solid #111;
+  border-radius: 2px;
+  padding: 5px;
+  width: 200px;
+  margin: 0;
+}
+
+.devtools-responsiveui-textinput[attention] {
+  border-color: #38ace6;
+  background: rgba(56,172,230,0.4);
+}
+
 .devtools-responsiveui-menulist,
 .devtools-responsiveui-toolbarbutton {
   -moz-appearance: none;
@@ -4061,11 +4087,11 @@ html|*#fullscreen-exit-button {
    We are copy/pasting variables from light-theme and dark-theme,
    since they aren't loaded in this context (within browser.css). */
 :root[devtoolstheme="light"] #developer-toolbar {
-  --gcli-background-color: #ebeced; /* --theme-tab-toolbar-background */
-  --gcli-input-background: #f0f1f2; /* --theme-toolbar-background */
-  --gcli-input-focused-background: #f7f7f7; /* --theme-sidebar-background */
-  --gcli-input-color: #18191a; /* --theme-body-color */
-  --gcli-border-color: #aaaaaa; /* --theme-splitter-color */
+  --gcli-background-color: #fcfcfc; /* --theme-tab-toolbar-background */
+  --gcli-input-background: #fcfcfc; /* --theme-toolbar-background */
+  --gcli-input-focused-background: #ffffff; /* --theme-sidebar-background */
+  --gcli-input-color: #393f4c; /* --theme-body-color */
+  --gcli-border-color: #dde1e4; /* --theme-splitter-color */
   --selection-background: #4c9ed9; /* --theme-selection-background */
   --selection-color: #f5f7fa; /* --theme-selection-color */
 }
@@ -4091,7 +4117,7 @@ html|*#fullscreen-exit-button {
 #developer-toolbar > toolbarbutton {
   -moz-appearance: none;
   border: none;
-  background: transparent;
+  background-color: transparent;
   margin: 0;
   padding: 0 10px;
   width: 32px;
@@ -4101,17 +4127,21 @@ html|*#fullscreen-exit-button {
   margin: auto 10px;
 }
 
-:root[devtoolstheme="light"] #developer-toolbar > toolbarbutton:not([checked=true]) > image,
+:root[devtoolstheme="light"] #developer-toolbar > .developer-toolbar-button:not([checked=true]) > image,
 :root[devtoolstheme="light"] .gclitoolbar-input-node:not([focused=true])::before  {
   filter: invert(1);
 }
 
-.developer-toolbar-button > .toolbarbutton-icon,
-#developer-toolbar-closebutton > .toolbarbutton-icon {
+.developer-toolbar-button > .toolbarbutton-icon {
   width: 16px;
   height: 16px;
 }
 
+/* The toolkit close button is low contrast in the dark theme so invert it. */
+:root[devtoolstheme="dark"] #developer-toolbar > .close-icon:not(:hover) > image {
+  filter: invert(1);
+}
+
 #developer-toolbar-toolbox-button {
   list-style-image: url("chrome://devtools/skin/images/toggle-tools.png");
   -moz-image-region: rect(0px, 16px, 16px, 0px);
@@ -4152,40 +4182,6 @@ html|*#fullscreen-exit-button {
   }
 }
 
-#developer-toolbar-closebutton {
-  list-style-image: url("chrome://devtools/skin/images/close.png");
-  -moz-appearance: none;
-  border: none;
-  margin: 0 4px;
-  min-width: 16px;
-  width: 16px;
-  opacity: 0.6;
-}
-
-@media (min-resolution: 1.1dppx) {
-  #developer-toolbar-closebutton {
-    list-style-image: url("chrome://devtools/skin/images/close@2x.png");
-  }
-}
-
-#developer-toolbar-closebutton > .toolbarbutton-icon {
-  /* XXX Buttons have padding in widget/ that we don't want here but can't override with good CSS, so we must
-     use evil CSS to give the impression of smaller content */
-  margin: -4px;
-}
-
-#developer-toolbar-closebutton > .toolbarbutton-text {
-  display: none;
-}
-
-#developer-toolbar-closebutton:hover {
-  opacity: 0.8;
-}
-
-#developer-toolbar-closebutton:hover:active {
-  opacity: 1;
-}
-
 /* GCLI */
 
 html|*#gcli-tooltip-frame,
@@ -4300,6 +4296,7 @@ html|*#gcli-output-frame {
 .gcli-in-closebrace {
   color: hsl(0,0%,80%);
 }
+
 #notification-popup[popupid="click-to-play-plugins"] > .panel-arrowcontainer > .panel-arrowcontent {
   padding: 0px;
 }
@@ -4366,6 +4363,11 @@ notification.pluginVulnerable {
 notification.pluginVulnerable .messageImage {
   list-style-image: url("chrome://browser/skin/notification-pluginBlocked.png");
 }
+
+notification.pluginVulnerable > .notification-inner > .messageCloseButton:not(:hover) {
+  background-image: -moz-image-rect(url("chrome://global/skin/icons/close.svg"), 0, 80, 16, 64);
+}
+
 #notification-popup[popupid="login-fill"] > .panel-arrowcontainer > .panel-arrowcontent {
   /* Since we display a sliding subview that extends to the border, we cannot
    * keep the default padding of arrow panels. We use the same padding in the
diff --git a/arc-firefox-theme/chrome/browser/sass/browser-dark.css b/arc-firefox-theme/chrome/browser/sass/browser-dark.css
index 276c192..49f2f1d 100644
--- a/arc-firefox-theme/chrome/browser/sass/browser-dark.css
+++ b/arc-firefox-theme/chrome/browser/sass/browser-dark.css
@@ -5,6 +5,7 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/* navbarInsetHighlight is tightly coupled to the toolbarHighlight constant. */
 :root {
   --toolbarbutton-hover-background: #444a58;
   --toolbarbutton-hover-boxshadow: none;
@@ -427,9 +428,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-image-region: rect(0px 48px 16px 32px); }
 
 #subscribeToPageMenuitem:not([disabled]),
-#subscribeToPageMenupopup,
-#BMB_subscribeToPageMenuitem:not([disabled]),
-#BMB_subscribeToPageMenupopup {
+#subscribeToPageMenupopup {
   list-style-image: url("chrome://browser/skin/page-livemarks.png"); }
 
 #bookmarksToolbarFolderMenu,
@@ -640,7 +639,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
     list-style-image: url("chrome://browser/skin/custom_images/dark/tabbar-icons.svg"); }
 
-#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
+#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
   list-style-image: url("chrome://browser/skin/custom_images/toolbar-icons-active.svg"); }
 
 #nav-bar #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker:not([disabled=true]):-moz-any([open], [checked], :hover:active) > .dropmarker-icon,
@@ -817,6 +816,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 1024px, 32px, 992px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(32px, 1024px, 64px, 992px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 416px, 32px, 384px); }
@@ -974,6 +976,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 2048px, 64px, 1984px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(64px, 2048px, 128px, 1984px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 832px, 64px, 768px); }
@@ -1167,7 +1172,10 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-appearance: toolbarbutton-dropdown;
   transition: opacity 0.15s ease; }
 
-#navigator-toolbox:not(:hover) .urlbar-history-dropmarker {
+#urlbar-wrapper[switchingtabs] > #urlbar > .urlbar-textbox-container > .urlbar-history-dropmarker {
+  transition: none; }
+
+#navigator-toolbox:not(:hover) #urlbar:not([focused]) > .urlbar-textbox-container > .urlbar-history-dropmarker {
   opacity: 0; }
 
 #urlbar-container {
@@ -1384,6 +1392,10 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   list-style-image: url(chrome://browser/skin/identity-mixed-active-blocked.svg);
   visibility: visible; }
 
+#urlbar[pageproxystate="valid"] > #identity-box.certUserOverridden > #connection-icon {
+  list-style-image: url(chrome://browser/skin/identity-mixed-passive-loaded.svg);
+  visibility: visible; }
+
 .popup-notification-icon {
   width: 64px;
   height: 64px;
@@ -1475,11 +1487,6 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   height: 16px;
   margin: 0 2px; }
 
-.identity-notification-icon,
-#identity-notification-icon {
-  list-style-image: url(chrome://mozapps/skin/profile/profileicon.png);
-  /* XXX: need HiDPI version */ }
-
 .geo-notification-icon,
 #geo-notification-icon {
   list-style-image: url(chrome://browser/skin/Geolocation-16.png); }
@@ -2800,6 +2807,20 @@ html|*#fullscreen-exit-button {
   box-shadow: none;
   border-bottom-width: 0; }
 
+.devtools-responsiveui-textinput {
+  -moz-appearance: none;
+  background: #333;
+  color: #fff;
+  border: 1px solid #111;
+  border-radius: 2px;
+  padding: 5px;
+  width: 200px;
+  margin: 0; }
+
+.devtools-responsiveui-textinput[attention] {
+  border-color: #38ace6;
+  background: rgba(56, 172, 230, 0.4); }
+
 .devtools-responsiveui-menulist,
 .devtools-responsiveui-toolbarbutton {
   -moz-appearance: none;
@@ -3047,15 +3068,15 @@ html|*#fullscreen-exit-button {
    We are copy/pasting variables from light-theme and dark-theme,
    since they aren't loaded in this context (within browser.css). */
 :root[devtoolstheme="light"] #developer-toolbar {
-  --gcli-background-color: #ebeced;
+  --gcli-background-color: #fcfcfc;
   /* --theme-tab-toolbar-background */
-  --gcli-input-background: #f0f1f2;
+  --gcli-input-background: #fcfcfc;
   /* --theme-toolbar-background */
-  --gcli-input-focused-background: #f7f7f7;
+  --gcli-input-focused-background: #ffffff;
   /* --theme-sidebar-background */
-  --gcli-input-color: #18191a;
+  --gcli-input-color: #393f4c;
   /* --theme-body-color */
-  --gcli-border-color: #aaaaaa;
+  --gcli-border-color: #dde1e4;
   /* --theme-splitter-color */
   --selection-background: #4c9ed9;
   /* --theme-selection-background */
@@ -3088,7 +3109,7 @@ html|*#fullscreen-exit-button {
 #developer-toolbar > toolbarbutton {
   -moz-appearance: none;
   border: none;
-  background: transparent;
+  background-color: transparent;
   margin: 0;
   padding: 0 10px;
   width: 32px; }
@@ -3096,15 +3117,18 @@ html|*#fullscreen-exit-button {
 .developer-toolbar-button > image {
   margin: auto 10px; }
 
-:root[devtoolstheme="light"] #developer-toolbar > toolbarbutton:not([checked=true]) > image,
+:root[devtoolstheme="light"] #developer-toolbar > .developer-toolbar-button:not([checked=true]) > image,
 :root[devtoolstheme="light"] .gclitoolbar-input-node:not([focused=true])::before {
   filter: invert(1); }
 
-.developer-toolbar-button > .toolbarbutton-icon,
-#developer-toolbar-closebutton > .toolbarbutton-icon {
+.developer-toolbar-button > .toolbarbutton-icon {
   width: 16px;
   height: 16px; }
 
+/* The toolkit close button is low contrast in the dark theme so invert it. */
+:root[devtoolstheme="dark"] #developer-toolbar > .close-icon:not(:hover) > image {
+  filter: invert(1); }
+
 #developer-toolbar-toolbox-button {
   list-style-image: url("chrome://devtools/skin/images/toggle-tools.png");
   -moz-image-region: rect(0px, 16px, 16px, 0px); }
@@ -3134,32 +3158,6 @@ html|*#fullscreen-exit-button {
 
   #developer-toolbar-toolbox-button[checked=true] {
     -moz-image-region: rect(0px, 128px, 32px, 96px); } }
-#developer-toolbar-closebutton {
-  list-style-image: url("chrome://devtools/skin/images/close.png");
-  -moz-appearance: none;
-  border: none;
-  margin: 0 4px;
-  min-width: 16px;
-  width: 16px;
-  opacity: 0.6; }
-
-@media (min-resolution: 1.1dppx) {
-  #developer-toolbar-closebutton {
-    list-style-image: url("chrome://devtools/skin/images/close@2x.png"); } }
-#developer-toolbar-closebutton > .toolbarbutton-icon {
-  /* XXX Buttons have padding in widget/ that we don't want here but can't override with good CSS, so we must
-     use evil CSS to give the impression of smaller content */
-  margin: -4px; }
-
-#developer-toolbar-closebutton > .toolbarbutton-text {
-  display: none; }
-
-#developer-toolbar-closebutton:hover {
-  opacity: 0.8; }
-
-#developer-toolbar-closebutton:hover:active {
-  opacity: 1; }
-
 /* GCLI */
 html|*#gcli-tooltip-frame,
 html|*#gcli-output-frame {
@@ -3308,6 +3306,9 @@ notification.pluginVulnerable {
 notification.pluginVulnerable .messageImage {
   list-style-image: url("chrome://browser/skin/notification-pluginBlocked.png"); }
 
+notification.pluginVulnerable > .notification-inner > .messageCloseButton:not(:hover) {
+  background-image: -moz-image-rect(url("chrome://global/skin/icons/close.svg"), 0, 80, 16, 64); }
+
 #notification-popup[popupid="login-fill"] > .panel-arrowcontainer > .panel-arrowcontent {
   /* Since we display a sliding subview that extends to the border, we cannot
    * keep the default padding of arrow panels. We use the same padding in the
diff --git a/arc-firefox-theme/chrome/browser/sass/browser-darker.css b/arc-firefox-theme/chrome/browser/sass/browser-darker.css
index d57d8fa..4a1a652 100644
--- a/arc-firefox-theme/chrome/browser/sass/browser-darker.css
+++ b/arc-firefox-theme/chrome/browser/sass/browser-darker.css
@@ -5,6 +5,7 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/* navbarInsetHighlight is tightly coupled to the toolbarHighlight constant. */
 :root {
   --toolbarbutton-hover-background: #fbfbfc;
   --toolbarbutton-hover-boxshadow: none;
@@ -427,9 +428,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-image-region: rect(0px 48px 16px 32px); }
 
 #subscribeToPageMenuitem:not([disabled]),
-#subscribeToPageMenupopup,
-#BMB_subscribeToPageMenuitem:not([disabled]),
-#BMB_subscribeToPageMenupopup {
+#subscribeToPageMenupopup {
   list-style-image: url("chrome://browser/skin/page-livemarks.png"); }
 
 #bookmarksToolbarFolderMenu,
@@ -640,7 +639,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
     list-style-image: url("chrome://browser/skin/custom_images/dark/tabbar-icons.svg"); }
 
-#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
+#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
   list-style-image: url("chrome://browser/skin/custom_images/toolbar-icons-active.svg"); }
 
 #nav-bar #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker:not([disabled=true]):-moz-any([open], [checked], :hover:active) > .dropmarker-icon,
@@ -817,6 +816,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 1024px, 32px, 992px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(32px, 1024px, 64px, 992px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 416px, 32px, 384px); }
@@ -974,6 +976,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 2048px, 64px, 1984px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(64px, 2048px, 128px, 1984px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 832px, 64px, 768px); }
@@ -1166,7 +1171,10 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-appearance: toolbarbutton-dropdown;
   transition: opacity 0.15s ease; }
 
-#navigator-toolbox:not(:hover) .urlbar-history-dropmarker {
+#urlbar-wrapper[switchingtabs] > #urlbar > .urlbar-textbox-container > .urlbar-history-dropmarker {
+  transition: none; }
+
+#navigator-toolbox:not(:hover) #urlbar:not([focused]) > .urlbar-textbox-container > .urlbar-history-dropmarker {
   opacity: 0; }
 
 #urlbar-container {
@@ -1383,6 +1391,10 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   list-style-image: url(chrome://browser/skin/identity-mixed-active-blocked.svg);
   visibility: visible; }
 
+#urlbar[pageproxystate="valid"] > #identity-box.certUserOverridden > #connection-icon {
+  list-style-image: url(chrome://browser/skin/identity-mixed-passive-loaded.svg);
+  visibility: visible; }
+
 .popup-notification-icon {
   width: 64px;
   height: 64px;
@@ -1474,11 +1486,6 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   height: 16px;
   margin: 0 2px; }
 
-.identity-notification-icon,
-#identity-notification-icon {
-  list-style-image: url(chrome://mozapps/skin/profile/profileicon.png);
-  /* XXX: need HiDPI version */ }
-
 .geo-notification-icon,
 #geo-notification-icon {
   list-style-image: url(chrome://browser/skin/Geolocation-16.png); }
@@ -2800,6 +2807,20 @@ html|*#fullscreen-exit-button {
   box-shadow: none;
   border-bottom-width: 0; }
 
+.devtools-responsiveui-textinput {
+  -moz-appearance: none;
+  background: #333;
+  color: #fff;
+  border: 1px solid #111;
+  border-radius: 2px;
+  padding: 5px;
+  width: 200px;
+  margin: 0; }
+
+.devtools-responsiveui-textinput[attention] {
+  border-color: #38ace6;
+  background: rgba(56, 172, 230, 0.4); }
+
 .devtools-responsiveui-menulist,
 .devtools-responsiveui-toolbarbutton {
   -moz-appearance: none;
@@ -3047,15 +3068,15 @@ html|*#fullscreen-exit-button {
    We are copy/pasting variables from light-theme and dark-theme,
    since they aren't loaded in this context (within browser.css). */
 :root[devtoolstheme="light"] #developer-toolbar {
-  --gcli-background-color: #ebeced;
+  --gcli-background-color: #fcfcfc;
   /* --theme-tab-toolbar-background */
-  --gcli-input-background: #f0f1f2;
+  --gcli-input-background: #fcfcfc;
   /* --theme-toolbar-background */
-  --gcli-input-focused-background: #f7f7f7;
+  --gcli-input-focused-background: #ffffff;
   /* --theme-sidebar-background */
-  --gcli-input-color: #18191a;
+  --gcli-input-color: #393f4c;
   /* --theme-body-color */
-  --gcli-border-color: #aaaaaa;
+  --gcli-border-color: #dde1e4;
   /* --theme-splitter-color */
   --selection-background: #4c9ed9;
   /* --theme-selection-background */
@@ -3088,7 +3109,7 @@ html|*#fullscreen-exit-button {
 #developer-toolbar > toolbarbutton {
   -moz-appearance: none;
   border: none;
-  background: transparent;
+  background-color: transparent;
   margin: 0;
   padding: 0 10px;
   width: 32px; }
@@ -3096,15 +3117,18 @@ html|*#fullscreen-exit-button {
 .developer-toolbar-button > image {
   margin: auto 10px; }
 
-:root[devtoolstheme="light"] #developer-toolbar > toolbarbutton:not([checked=true]) > image,
+:root[devtoolstheme="light"] #developer-toolbar > .developer-toolbar-button:not([checked=true]) > image,
 :root[devtoolstheme="light"] .gclitoolbar-input-node:not([focused=true])::before {
   filter: invert(1); }
 
-.developer-toolbar-button > .toolbarbutton-icon,
-#developer-toolbar-closebutton > .toolbarbutton-icon {
+.developer-toolbar-button > .toolbarbutton-icon {
   width: 16px;
   height: 16px; }
 
+/* The toolkit close button is low contrast in the dark theme so invert it. */
+:root[devtoolstheme="dark"] #developer-toolbar > .close-icon:not(:hover) > image {
+  filter: invert(1); }
+
 #developer-toolbar-toolbox-button {
   list-style-image: url("chrome://devtools/skin/images/toggle-tools.png");
   -moz-image-region: rect(0px, 16px, 16px, 0px); }
@@ -3134,32 +3158,6 @@ html|*#fullscreen-exit-button {
 
   #developer-toolbar-toolbox-button[checked=true] {
     -moz-image-region: rect(0px, 128px, 32px, 96px); } }
-#developer-toolbar-closebutton {
-  list-style-image: url("chrome://devtools/skin/images/close.png");
-  -moz-appearance: none;
-  border: none;
-  margin: 0 4px;
-  min-width: 16px;
-  width: 16px;
-  opacity: 0.6; }
-
-@media (min-resolution: 1.1dppx) {
-  #developer-toolbar-closebutton {
-    list-style-image: url("chrome://devtools/skin/images/close@2x.png"); } }
-#developer-toolbar-closebutton > .toolbarbutton-icon {
-  /* XXX Buttons have padding in widget/ that we don't want here but can't override with good CSS, so we must
-     use evil CSS to give the impression of smaller content */
-  margin: -4px; }
-
-#developer-toolbar-closebutton > .toolbarbutton-text {
-  display: none; }
-
-#developer-toolbar-closebutton:hover {
-  opacity: 0.8; }
-
-#developer-toolbar-closebutton:hover:active {
-  opacity: 1; }
-
 /* GCLI */
 html|*#gcli-tooltip-frame,
 html|*#gcli-output-frame {
@@ -3308,6 +3306,9 @@ notification.pluginVulnerable {
 notification.pluginVulnerable .messageImage {
   list-style-image: url("chrome://browser/skin/notification-pluginBlocked.png"); }
 
+notification.pluginVulnerable > .notification-inner > .messageCloseButton:not(:hover) {
+  background-image: -moz-image-rect(url("chrome://global/skin/icons/close.svg"), 0, 80, 16, 64); }
+
 #notification-popup[popupid="login-fill"] > .panel-arrowcontainer > .panel-arrowcontent {
   /* Since we display a sliding subview that extends to the border, we cannot
    * keep the default padding of arrow panels. We use the same padding in the
diff --git a/arc-firefox-theme/chrome/browser/sass/browser-light.css b/arc-firefox-theme/chrome/browser/sass/browser-light.css
index c874a40..3ef2f72 100644
--- a/arc-firefox-theme/chrome/browser/sass/browser-light.css
+++ b/arc-firefox-theme/chrome/browser/sass/browser-light.css
@@ -5,6 +5,7 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/* navbarInsetHighlight is tightly coupled to the toolbarHighlight constant. */
 :root {
   --toolbarbutton-hover-background: #fbfbfc;
   --toolbarbutton-hover-boxshadow: none;
@@ -427,9 +428,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-image-region: rect(0px 48px 16px 32px); }
 
 #subscribeToPageMenuitem:not([disabled]),
-#subscribeToPageMenupopup,
-#BMB_subscribeToPageMenuitem:not([disabled]),
-#BMB_subscribeToPageMenupopup {
+#subscribeToPageMenupopup {
   list-style-image: url("chrome://browser/skin/page-livemarks.png"); }
 
 #bookmarksToolbarFolderMenu,
@@ -640,7 +639,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
     list-style-image: url("chrome://browser/skin/custom_images/light/tabbar-icons.svg"); }
 
-#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
+#nav-bar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #back-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #forward-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #home-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #print-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #downloads-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-tab-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #new-window-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #fullscreen-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sync-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #feed-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #social-share-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #open-file-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #find-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #developer-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #preferences-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #privatebrowsing-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #save-page-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #add-ons-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #history-panelmenu:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #nav-bar-overflow-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #PanelUI-menu-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #characterencoding-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #email-link-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #sidebar-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-out-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-reset-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #zoom-in-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #cut-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #copy-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #paste-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #e10s-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #panic-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #nav-bar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active), #TabsToolbar #webide-button:not([disabled=true]):-moz-any([open], [checked], :hover:active) {
   list-style-image: url("chrome://browser/skin/custom_images/toolbar-icons-active.svg"); }
 
 #nav-bar #bookmarks-menu-button > .toolbarbutton-menubutton-dropmarker:not([disabled=true]):-moz-any([open], [checked], :hover:active) > .dropmarker-icon,
@@ -817,6 +816,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 1024px, 32px, 992px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(32px, 1024px, 64px, 992px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 416px, 32px, 384px); }
@@ -974,6 +976,9 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   toolbarpaletteitem[place="palette"] > #sync-button {
     -moz-image-region: rect(0px, 2048px, 64px, 1984px); }
 
+  #sync-button[cui-areatype="menu-panel"][panel-multiview-anchor=true] {
+    -moz-image-region: rect(64px, 2048px, 128px, 1984px); }
+
   #feed-button[cui-areatype="menu-panel"],
   toolbarpaletteitem[place="palette"] > #feed-button {
     -moz-image-region: rect(0px, 832px, 64px, 768px); }
@@ -1166,7 +1171,10 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
   -moz-appearance: toolbarbutton-dropdown;
   transition: opacity 0.15s ease; }
 
-#navigator-toolbox:not(:hover) .urlbar-history-dropmarker {
+#urlbar-wrapper[switchingtabs] > #urlbar > .urlbar-textbox-container > .urlbar-history-dropmarker {
+  transition: none; }
+
+#navigator-toolbox:not(:hover) #urlbar:not([focused]) > .urlbar-textbox-container > .urlbar-history-dropmarker {
   opacity: 0; }
 
 #urlbar-container {
@@ -1383,6 +1391,10 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   list-style-image: url(chrome://browser/skin/identity-mixed-active-blocked.svg);
   visibility: visible; }
 
+#urlbar[pageproxystate="valid"] > #identity-box.certUserOverridden > #connection-icon {
+  list-style-image: url(chrome://browser/skin/identity-mixed-passive-loaded.svg);
+  visibility: visible; }
+
 .popup-notification-icon {
   width: 64px;
   height: 64px;
@@ -1474,11 +1486,6 @@ window:not([chromehidden~="toolbar"]) #urlbar-wrapper > #urlbar > #identity-box
   height: 16px;
   margin: 0 2px; }
 
-.identity-notification-icon,
-#identity-notification-icon {
-  list-style-image: url(chrome://mozapps/skin/profile/profileicon.png);
-  /* XXX: need HiDPI version */ }
-
 .geo-notification-icon,
 #geo-notification-icon {
   list-style-image: url(chrome://browser/skin/Geolocation-16.png); }
@@ -2800,6 +2807,20 @@ html|*#fullscreen-exit-button {
   box-shadow: none;
   border-bottom-width: 0; }
 
+.devtools-responsiveui-textinput {
+  -moz-appearance: none;
+  background: #333;
+  color: #fff;
+  border: 1px solid #111;
+  border-radius: 2px;
+  padding: 5px;
+  width: 200px;
+  margin: 0; }
+
+.devtools-responsiveui-textinput[attention] {
+  border-color: #38ace6;
+  background: rgba(56, 172, 230, 0.4); }
+
 .devtools-responsiveui-menulist,
 .devtools-responsiveui-toolbarbutton {
   -moz-appearance: none;
@@ -3047,15 +3068,15 @@ html|*#fullscreen-exit-button {
    We are copy/pasting variables from light-theme and dark-theme,
    since they aren't loaded in this context (within browser.css). */
 :root[devtoolstheme="light"] #developer-toolbar {
-  --gcli-background-color: #ebeced;
+  --gcli-background-color: #fcfcfc;
   /* --theme-tab-toolbar-background */
-  --gcli-input-background: #f0f1f2;
+  --gcli-input-background: #fcfcfc;
   /* --theme-toolbar-background */
-  --gcli-input-focused-background: #f7f7f7;
+  --gcli-input-focused-background: #ffffff;
   /* --theme-sidebar-background */
-  --gcli-input-color: #18191a;
+  --gcli-input-color: #393f4c;
   /* --theme-body-color */
-  --gcli-border-color: #aaaaaa;
+  --gcli-border-color: #dde1e4;
   /* --theme-splitter-color */
   --selection-background: #4c9ed9;
   /* --theme-selection-background */
@@ -3088,7 +3109,7 @@ html|*#fullscreen-exit-button {
 #developer-toolbar > toolbarbutton {
   -moz-appearance: none;
   border: none;
-  background: transparent;
+  background-color: transparent;
   margin: 0;
   padding: 0 10px;
   width: 32px; }
@@ -3096,15 +3117,18 @@ html|*#fullscreen-exit-button {
 .developer-toolbar-button > image {
   margin: auto 10px; }
 
-:root[devtoolstheme="light"] #developer-toolbar > toolbarbutton:not([checked=true]) > image,
+:root[devtoolstheme="light"] #developer-toolbar > .developer-toolbar-button:not([checked=true]) > image,
 :root[devtoolstheme="light"] .gclitoolbar-input-node:not([focused=true])::before {
   filter: invert(1); }
 
-.developer-toolbar-button > .toolbarbutton-icon,
-#developer-toolbar-closebutton > .toolbarbutton-icon {
+.developer-toolbar-button > .toolbarbutton-icon {
   width: 16px;
   height: 16px; }
 
+/* The toolkit close button is low contrast in the dark theme so invert it. */
+:root[devtoolstheme="dark"] #developer-toolbar > .close-icon:not(:hover) > image {
+  filter: invert(1); }
+
 #developer-toolbar-toolbox-button {
   list-style-image: url("chrome://devtools/skin/images/toggle-tools.png");
   -moz-image-region: rect(0px, 16px, 16px, 0px); }
@@ -3134,32 +3158,6 @@ html|*#fullscreen-exit-button {
 
   #developer-toolbar-toolbox-button[checked=true] {
     -moz-image-region: rect(0px, 128px, 32px, 96px); } }
-#developer-toolbar-closebutton {
-  list-style-image: url("chrome://devtools/skin/images/close.png");
-  -moz-appearance: none;
-  border: none;
-  margin: 0 4px;
-  min-width: 16px;
-  width: 16px;
-  opacity: 0.6; }
-
-@media (min-resolution: 1.1dppx) {
-  #developer-toolbar-closebutton {
-    list-style-image: url("chrome://devtools/skin/images/close@2x.png"); } }
-#developer-toolbar-closebutton > .toolbarbutton-icon {
-  /* XXX Buttons have padding in widget/ that we don't want here but can't override with good CSS, so we must
-     use evil CSS to give the impression of smaller content */
-  margin: -4px; }
-
-#developer-toolbar-closebutton > .toolbarbutton-text {
-  display: none; }
-
-#developer-toolbar-closebutton:hover {
-  opacity: 0.8; }
-
-#developer-toolbar-closebutton:hover:active {
-  opacity: 1; }
-
 /* GCLI */
 html|*#gcli-tooltip-frame,
 html|*#gcli-output-frame {
@@ -3308,6 +3306,9 @@ notification.pluginVulnerable {
 notification.pluginVulnerable .messageImage {
   list-style-image: url("chrome://browser/skin/notification-pluginBlocked.png"); }
 
+notification.pluginVulnerable > .notification-inner > .messageCloseButton:not(:hover) {
+  background-image: -moz-image-rect(url("chrome://global/skin/icons/close.svg"), 0, 80, 16, 64); }
+
 #notification-popup[popupid="login-fill"] > .panel-arrowcontainer > .panel-arrowcontent {
   /* Since we display a sliding subview that extends to the border, we cannot
    * keep the default padding of arrow panels. We use the same padding in the
diff --git a/arc-firefox-theme/chrome/browser/syncedtabs/sidebar.css b/arc-firefox-theme/chrome/browser/syncedtabs/sidebar.css
new file mode 100644
index 0000000..2311d6f
--- /dev/null
+++ b/arc-firefox-theme/chrome/browser/syncedtabs/sidebar.css
@@ -0,0 +1,246 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/* These styles are intended to mimic XUL trees and the XUL search box. */
+
+:root, body {
+  overflow-x: hidden;
+}
+
+body {
+  margin: 0;
+  font: message-box;
+  color: #333333;
+  -moz-user-select: none;
+  overflow: hidden;
+}
+
+.emptyListInfo {
+  cursor: default;
+  padding: 3em 1em;
+  text-align: center;
+}
+
+.list,
+.item-tabs-list {
+  display: flex;
+  flex-flow: column;
+  flex-grow: 1;
+}
+
+.item.client {
+  opacity: 1;
+  max-height: unset;
+  display: unset;
+}
+
+.item.client.closed .item-tabs-list {
+  display: none;
+}
+
+.item {
+  display: inline-block;
+  opacity: 1;
+  flex: 1;
+  min-width: 0;
+  white-space: nowrap;
+  overflow: hidden;
+  outline: none;
+  color: -moz-FieldText;
+}
+
+.item.selected > .item-title-container {
+  background-color: -moz-cellhighlight;
+  color: -moz-cellhighlighttext;
+  font-weight: bold;
+}
+
+.item.selected:focus > .item-title-container {
+  background-color: Highlight;
+  color: HighlightText;
+}
+
+.client .item.tab > .item-title-container {
+  padding-inline-start: 35px;
+}
+.item.tab > .item-title-container {
+  padding-inline-start: 20px;
+}
+
+.item-icon-container {
+  min-width: 16px;
+  max-width: 16px;
+  min-height: 16px;
+  max-height: 16px;
+  margin-right: 5px;
+  margin-left: 5px;
+  background-size: 16px 16px;
+  background-size: contain;
+  background-repeat: no-repeat;
+  background-position: center;
+}
+
+.item-title-container {
+  display: flex;
+  flex-flow: row;
+  overflow: hidden;
+  flex-grow: 1;
+  padding: 1px 0px 1px 0px;
+}
+
+.item-title {
+  flex-grow: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  margin: 0px;
+  line-height: 1.3;
+}
+
+.item[hidden] {
+  opacity: 0;
+  max-height: 0;
+  transition: opacity 150ms ease-in-out, max-height 150ms ease-in-out 150ms;
+}
+
+.item.empty .item-title-container {
+  color: #aeaeae;
+}
+
+.client .item.empty > .item-title-container {
+  padding-inline-start: 35px;
+}
+
+.text-input-box {
+  display: flex;
+  flex-flow: row nowrap;
+}
+
+.textbox-input-box {
+  display: flex;
+  flex-direction: row;
+}
+
+.tabsFilter {
+  flex: 1;
+  /* min-width of anything to override the implicit "-moz-min-content" value.
+     0px is safe as the sidebar itself has a constrained size meaning we will
+     never actually hit this minimum
+  */
+  min-width: 0px;
+}
+
+.sync-state > p {
+  padding-inline-end: 10px;
+  padding-inline-start: 10px;
+  color: #888;
+}
+
+.text-link {
+  color: rgb(0, 149, 221);
+  cursor: pointer;
+}
+
+.text-link:hover {
+  text-decoration: underline;
+}
+
+.text-link,
+.text-link:focus {
+  margin: 0px;
+  padding: 0px;
+  border: 0px;
+}
+
+.deck .sync-state {
+  display: none;
+  opacity: 0;
+  transition: opacity 1.5s;
+  border-top: 1px solid #bdbdbd;
+}
+
+.deck .sync-state.tabs-container {
+  border-top: 0px;
+}
+
+.deck .sync-state.selected {
+  display: unset;
+  opacity: 100;
+}
+
+.textbox-search-clear:not([disabled]) {
+  cursor: default;
+}
+
+.textbox-search-icons .textbox-search-clear,
+.filtered .textbox-search-icons .textbox-search-icon {
+  display: none;
+}
+
+.filtered .textbox-search-icons .textbox-search-clear {
+  display: block;
+}
+
+/* These styles are intended to mimic XUL trees and the XUL search box. */
+
+html {
+  border: 1px solid ThreeDShadow;
+  background-color: -moz-Field;
+  color: -moz-FieldText;
+  box-sizing: border-box;
+}
+
+.item {
+  -moz-padding-end: 0;
+}
+
+.item-title {
+  margin: 1px 0 0;
+  -moz-margin-end: 6px;
+}
+
+
+.search-box {
+  -moz-appearance: textfield;
+  cursor: text;
+  margin: 2px 4px;
+  border: 2px solid;
+  -moz-border-top-colors: ThreeDShadow ThreeDDarkShadow;
+  -moz-border-right-colors: ThreeDHighlight ThreeDLightShadow;
+  -moz-border-bottom-colors: ThreeDHighlight ThreeDLightShadow;
+  -moz-border-left-colors: ThreeDShadow ThreeDDarkShadow;
+  padding: 2px 2px 3px;
+  -moz-padding-start: 4px;
+  background-color: -moz-Field;
+  color: -moz-FieldText;
+}
+
+.textbox-search-clear {
+  background-image: url(moz-icon://stock/gtk-clear?size=menu);
+  background-repeat: no-repeat;
+  width: 16px;
+  height: 16px;
+}
+
+.textbox-search-icon {
+  background-image: url(moz-icon://stock/gtk-find?size=menu);
+  background-repeat: no-repeat;
+  width: 16px;
+  height: 16px;
+  display: block;
+}
+
+.textbox-search-icon[searchbutton]:not([disabled]) ,
+.textbox-search-clear:not([disabled]) {
+  cursor: pointer;
+}
+
+.item.client .item-twisty-container {
+  -moz-appearance: treetwistyopen;
+  margin-top: 3px;
+}
+
+.item.client.closed .item-twisty-container {
+  -moz-appearance: treetwisty;
+}
diff --git a/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-end.svg b/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-end.svg
index da9c882..75d70c9 100644
--- a/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-end.svg
+++ b/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-end.svg
@@ -12,7 +12,7 @@
 /* navbarInsetHighlight is tightly coupled to the toolbarHighlight constant. */
       #tab-background-fill {
         background-color: -moz-dialog;
-        background-image: linear-gradient(transparent 2px, hsla(0,0%,100%,.05) 2px, hsla(0,0%,100%,.05));
+        background-image: linear-gradient(transparent 2px, hsla(0,0%,100%,.15) 2px, hsla(0,0%,100%,.15));
         background-repeat: no-repeat;
         height: 100%;
         width: 100%;
diff --git a/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-start.svg b/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-start.svg
index 8f91c4b..66d75dd 100644
--- a/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-start.svg
+++ b/arc-firefox-theme/chrome/browser/tabbrowser/tab-selected-start.svg
@@ -12,7 +12,7 @@
 /* navbarInsetHighlight is tightly coupled to the toolbarHighlight constant. */
       #tab-background-fill {
         background-color: -moz-dialog;
-        background-image: linear-gradient(transparent 2px, hsla(0,0%,100%,.05) 2px, hsla(0,0%,100%,.05));
+        background-image: linear-gradient(transparent 2px, hsla(0,0%,100%,.15) 2px, hsla(0,0%,100%,.15));
         background-repeat: no-repeat;
         height: 100%;
         width: 100%;
diff --git a/arc-firefox-theme/chrome/global/aboutReaderContent.css b/arc-firefox-theme/chrome/global/aboutReaderContent.css
index 8412751..94972c5 100644
--- a/arc-firefox-theme/chrome/global/aboutReaderContent.css
+++ b/arc-firefox-theme/chrome/global/aboutReaderContent.css
@@ -55,7 +55,9 @@ ol,
 li,
 figure,
 .wp-caption {
-  margin: 0 0 30px 0;
+  margin: -10px -10px 20px -10px;
+  padding: 10px;
+  border-radius: 5px;
 }
 
 p > img:only-child,
diff --git a/arc-firefox-theme/chrome/global/aboutReaderControls.css b/arc-firefox-theme/chrome/global/aboutReaderControls.css
index 2af3bef..b640e3c 100644
--- a/arc-firefox-theme/chrome/global/aboutReaderControls.css
+++ b/arc-firefox-theme/chrome/global/aboutReaderControls.css
@@ -120,7 +120,7 @@
   padding: 0;
 }
 
-/*======= Font style popup =======*/
+/*======= Popup =======*/
 
 .dropdown-popup {
   min-width: 300px;
@@ -136,6 +136,10 @@
   box-shadow: 0 1px 12px #666;
 }
 
+.keep-open .dropdown-popup {
+  z-index: initial;
+}
+
 .dropdown-popup > hr {
   display: none;
 }
@@ -154,6 +158,8 @@
   display: block;
 }
 
+/*======= Font style popup =======*/
+
 #font-type-buttons,
 #font-size-buttons,
 #color-scheme-buttons {
@@ -274,38 +280,8 @@
   background-position: center;
 }
 
-.footer {
-  height: 64px;
-  background-color: #ebebeb;
-  position: absolute;
-  left: 0;
-  width: 100%;
-  text-align: center;
-  padding: 12px 0;
-  box-sizing: border-box;
-  box-shadow: 0 3px 3px -3px rgba(0, 0, 0, 0.35) inset;
-}
-
-.remove-button {
-  background-image: url("chrome://global/skin/reader/RM-Delete-24x24.svg");
-  margin: 0 auto;
-  border: 1px solid #c1c1c1;
-  background-position: 10px 7px;
-  padding-left: 42px;
-  padding-right: 10px;
-  border-radius: 2px;
-  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
-  font-size: 18px;
-}
-
-
 /*======= Toolbar icons =======*/
 
-/* Android-only controls */
-.share-button {
-  display: none;
-}
-
 .close-button {
   background-image: url("chrome://global/skin/reader/RM-Close-24x24.svg#close");
   height: 68px;
@@ -330,21 +306,6 @@
   background-image: url("chrome://global/skin/reader/RM-Type-Controls-24x24.svg");
 }
 
-.toggle-button.on {
-  background-image: url("chrome://global/skin/reader/RM-Delete-24x24.svg");
-}
-
-.toggle-button {
-  background-image: url("chrome://global/skin/reader/RM-Add-24x24.svg");
-}
-
-.list-button {
-  background-image: url("chrome://global/skin/reader/RM-Reading-List-24x24.svg");
-}
-.list-button.on {
-  background-color: #d9d9d9;
-}
-
 .minus-button {
   background-image: url("chrome://global/skin/reader/RM-Minus-24x24.svg");
 }
@@ -357,7 +318,4 @@
   .toolbar {
     display: none !important;
   }
-  .footer {
-    display: none !important;
-  }
 }
diff --git a/arc-firefox-theme/chrome/global/alerts/alert-common.css b/arc-firefox-theme/chrome/global/alerts/alert-common.css
index 20d9e7b..a58388e 100644
--- a/arc-firefox-theme/chrome/global/alerts/alert-common.css
+++ b/arc-firefox-theme/chrome/global/alerts/alert-common.css
@@ -53,6 +53,22 @@
   }
 }
 
+#alertIcon {
+  margin-top: 6px;
+  margin-inline-start: 8px;
+  margin-inline-end: 0;
+  margin-bottom: 0;
+  width: 16px;
+  min-height: 16px;
+  max-height: 16px;
+}
+
+@media (resolution: 2dppx) {
+  #alertIcon {
+    image-rendering: -moz-crisp-edges;
+  }
+}
+
 #alertImage {
   width: 80px;
   height: 80px;
diff --git a/arc-firefox-theme/chrome/global/in-content/common.css b/arc-firefox-theme/chrome/global/in-content/common.css
index c78132c..414a9c1 100644
--- a/arc-firefox-theme/chrome/global/in-content/common.css
+++ b/arc-firefox-theme/chrome/global/in-content/common.css
@@ -596,7 +596,8 @@ xul|*.radio-label-box {
   background-color: var(--in-content-category-background-hover);
 }
 
-*|*.category[selected] {
+*|*.category[selected],
+*|*.category.selected {
   background-color: var(--in-content-category-background-active);
   color: var(--in-content-category-text-selected);
   -moz-padding-start: 11px; /* compensate the 4px border */
diff --git a/arc-firefox-theme/chrome/global/narrate.css b/arc-firefox-theme/chrome/global/narrate.css
new file mode 100644
index 0000000..3aa8a8a
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate.css
@@ -0,0 +1,11 @@
+body.light .narrating {
+  background-color: #ffc;
+}
+
+body.sepia .narrating {
+  background-color: #e0d7c5;
+}
+
+body.dark .narrating {
+  background-color: #242424;
+}
diff --git a/arc-firefox-theme/chrome/global/narrate/arrow.svg b/arc-firefox-theme/chrome/global/narrate/arrow.svg
new file mode 100644
index 0000000..2fb2141
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/arrow.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 12 12">
+  <path d="M6 9L1 4l1-1 4 4 4-4 1 1z" fill="#4C4C4C"/>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrate/back.svg b/arc-firefox-theme/chrome/global/narrate/back.svg
new file mode 100644
index 0000000..d29586e
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/back.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24">
+  <defs>
+    <style>
+      use:not(:target) {
+        display: none;
+      }
+      #disabled {
+        opacity: 0.5;
+      }
+    </style>
+    <path id="shape" d="M 5 0 C 4.446 0 4 0.446 4 1 L 4 23 C 4 23.554 4.446 24 5 24 L 7 24 C 7.554 24 8 23.554 8 23 L 8 12.404297 C 8.04108 12.509297 8.109944 12.610125 8.203125 12.703125 L 19.296875 23.775391 C 19.495259 23.972391 19.661613 24.039562 19.796875 23.976562 C 19.932137 23.915564 20 23.748516 20 23.478516 L 20 0.52148438 C 20 0.25248437 19.93214 0.084484365 19.796875 0.021484375 C 19.661613 -0.040515625 19.495259 0.02856248 19.296875 0.2265625 L 8.203125 11.298828 C 8.1099445 11.381828 8.04108 11.481703 8 11.595703 L 8 1 C 8 0.446 7.554 0 7 0 L 5 0 z " fill="gray"/>
+  </defs>
+  <use id="enabled" xlink:href="#shape"/>
+  <use id="disabled" xlink:href="#shape"/>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrate/fast.svg b/arc-firefox-theme/chrome/global/narrate/fast.svg
new file mode 100644
index 0000000..cd25a6a
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/fast.svg
@@ -0,0 +1,3 @@
+<svg id="Icons" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 20.4">
+    <path fill="gray" d="M14.42 16.68a.77.77 0 0 0 .54.7l2.51.68a1.58 1.58 0 0 1 1.06 1.22l.05.39-3.89-.53a4.34 4.34 0 0 1-1.74-.72L7.2 14.03a5.79 5.79 0 0 1-5.34-4.88h-.82a1 1 0 0 1-1-1l2.9-3.24a6.16 6.16 0 0 1 4.7-2.39 5.88 5.88 0 0 1 .77.05 5 5 0 0 1 .87.15c3.75 1 6.5 5.84 6.5 5.84a2.27 2.27 0 0 0 1.14.85h.17a1.27 1.27 0 0 0 1.22-.4l.78-1-2.47-1.2c-3.38-1.46-2.46-5.71-2.46-5.71 0-.26.23-.32.42-.14l5.32 5-4.31-4.81a1.39 1.39 0 0 1 .81-1.22l4.17 6.65.33.31 2.19 1.54a2.44 2.44 0 0 1 .92 1.75v2.77l-.16.13a1.66 1.66 0 0 1-1.63.19l-.75-.36a2.57 2.57 0 0 0-2.55.32l-2.18 1.82a4.28 4.28 0 0 1-.89.55 10.18 10.18 0 0 0-4.62-8.46c-.27-.16-.66.31-.47.48a10.52 10.52 0 0 1 3.68 8.5v.48zm8.38-5.42a.49.49 0 1 0-.49-.49.49.49 0 0 0 .49.49zm-18 9.14v-.52a1.39 1.39 0 0 1 .93-1.25s2.7-.66 3.43-1.84l2.06 1.63a25.62 25.62 0 0 1-6.43 2z"/>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrate/forward.svg b/arc-firefox-theme/chrome/global/narrate/forward.svg
new file mode 100644
index 0000000..53e64e9
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/forward.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24">
+  <defs>
+    <style>
+      use:not(:target) {
+        display: none;
+      }
+      #disabled {
+        opacity: 0.5;
+      }
+    </style>
+    <path id="shape" d="m 19,0 c 0.554,0 1,0.446 1,1 l 0,22 c 0,0.554 -0.446,1 -1,1 l -2,0 c -0.554,0 -1,-0.446 -1,-1 l 0,-10.595703 c -0.04108,0.105 -0.109944,0.205828 -0.203125,0.298828 L 4.703125,23.775391 c -0.198384,0.197 -0.364738,0.264171 -0.5,0.201171 C 4.067863,23.915564 4,23.748516 4,23.478516 L 4,0.52148438 c 0,-0.26900001 0.06786,-0.43700001 0.203125,-0.5 0.135262,-0.062 0.301616,0.0070781 0.5,0.20507812 l 11.09375,11.0722655 c 0.09318,0.083 0.162045,0.182875 0.203125,0.296875 L 16,1 c 0,-0.554 0.446,-1 1,-1 l 2,0 z" fill="gray"/>
+  </defs>
+  <use id="enabled" xlink:href="#shape"/>
+  <use id="disabled" xlink:href="#shape"/>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrate/narrate.svg b/arc-firefox-theme/chrome/global/narrate/narrate.svg
new file mode 100644
index 0000000..597b0a6
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/narrate.svg
@@ -0,0 +1,3 @@
+<svg id="Icons" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 18.77">
+    <path fill="gray" d="M3.13 13.72a1.57 1.57 0 0 1-3.13 0V5.41a1.57 1.57 0 0 1 3.13 0v8.31zm6.29 3.62a1.57 1.57 0 0 1-3.13 0V1.44a1.57 1.57 0 0 1 3.13 0v15.9zm6.29-2.9a1.57 1.57 0 0 1-3.13 0V4.83a1.57 1.57 0 0 1 3.13 0v9.61zM22 12.62a1.57 1.57 0 0 1-3.13 0V6.15a1.57 1.57 0 0 1 3.13 0v6.47z"/>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrate/slow.svg b/arc-firefox-theme/chrome/global/narrate/slow.svg
new file mode 100644
index 0000000..1892b66
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/slow.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+    <g fill="gray">
+        <path d="M1.684,13.486c-0.209,0-0.404-0.132-0.474-0.341c-0.528-1.58-0.23-5.767,4.097-7.921 c1.315-0.656,2.589-0.988,3.787-0.988c3.237,0,5.096,2.341,5.99,3.465c0.158,0.199,0.181,0.533,0,0.713 c-0.793,0.794-1.852,1.542-3.231,2.286c-2.46,1.327-5.045,1.775-7.121,2.134c-1.123,0.194-2.093,0.361-2.89,0.627 C1.789,13.479,1.735,13.486,1.684,13.486L1.684,13.486z"/>
+        <path d="M23.185,5.465c-0.86-1.121-2.074-1.819-3.168-1.819c-0.641,0-1.556,0.23-2.273,1.328 c-0.374,0.571-0.577,1.161-0.773,1.73c-0.512,1.482-1.041,3.016-4.662,4.969c-2.316,1.249-4.707,1.664-6.815,2.03 c-2.524,0.438-4.704,0.814-5.455,2.622c-0.069,0.165-0.045,0.354,0.062,0.495c0.107,0.143,0.281,0.217,0.46,0.193 c0.667-0.081,1.533,0.041,2.434,0.217c-0.122,0.146-0.261,0.286-0.391,0.418c-0.38,0.385-0.774,0.783-0.657,1.292 c0.108,0.474,0.604,0.699,0.966,0.828c0.399,0.142,0.843,0.217,1.283,0.217c1.241,0,2.216-0.579,2.649-1.539 c1.704,0.287,3.487,0.313,5.043,0.313l1.639-0.006c0.066,0.056,0.178,0.166,0.264,0.25c0.504,0.506,1.348,1.351,2.721,1.351 c0.129,0,0.264-0.008,0.416-0.026c0.687-0.102,1.351-0.267,1.574-0.787c0.227-0.528-0.123-1.023-0.526-1.597 c-0.481-0.685-1.08-1.532-0.998-2.652c0.196-0.397,0.368-0.824,0.546-1.267c0.479-1.19,0.975-2.421,2.12-3.513 c0.431,0.343,1.022,0.549,1.63,0.549l0,0c0.439,0,0.876-0.102,1.295-0.3c0.624-0.293,1.104-0.967,1.316-1.847 C24.175,7.707,23.914,6.418,23.185,5.465L23.185,5.465z M20.397,7.757c-0.276,0-0.5-0.224-0.5-0.5s0.224-0.5,0.5-0.5 c0.275,0,0.5,0.224,0.5,0.5S20.674,7.757,20.397,7.757z"/>
+    </g>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrate/start.svg b/arc-firefox-theme/chrome/global/narrate/start.svg
new file mode 100644
index 0000000..95fa713
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/start.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+    <path d="M21.64 12.44L2.827 22.895c-.217.123-.403.137-.56.042-.155-.094-.233-.264-.233-.51V1.572c0-.244.08-.414.233-.51.157-.093.343-.08.56.044L21.642 11.56c.217.124.326.27.326.44 0 .17-.11.316-.327.44z" fill="gray"/>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrate/stop.svg b/arc-firefox-theme/chrome/global/narrate/stop.svg
new file mode 100644
index 0000000..c017c57
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrate/stop.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+    <rect ry="1" rx="1" y="2" x="2" height="20" width="20" fill="gray"/>
+</svg>
diff --git a/arc-firefox-theme/chrome/global/narrateControls.css b/arc-firefox-theme/chrome/global/narrateControls.css
new file mode 100644
index 0000000..dc24a4c
--- /dev/null
+++ b/arc-firefox-theme/chrome/global/narrateControls.css
@@ -0,0 +1,184 @@
+:scope {
+  --border-color: #e5e5e5;
+}
+
+#narrate-toggle {
+  background-image: url("chrome://global/skin/narrate/narrate.svg");
+}
+
+.dropdown-popup button {
+  background-color: transparent;
+}
+
+.dropdown-popup button:hover:not(:disabled) {
+  background-color: #eaeaea;
+}
+
+.narrate-row {
+  display: flex;
+  align-items: center;
+  min-height: 40px;
+  box-sizing: border-box;
+}
+
+.narrate-row:not(:first-child) {
+  border-top: 1px solid var(--border-color);
+}
+
+/* Control buttons */
+
+#narrate-control > button {
+  background-size: 24px 24px;
+  background-repeat: no-repeat;
+  background-position: center center;
+  height: 64px;
+  width: 100px;
+  border: none;
+  color: #666;
+  box-sizing: border-box;
+}
+
+#narrate-control > button:not(:first-child) {
+  border-left: 1px solid var(--border-color);
+}
+
+#narrate-skip-previous {
+  border-top-left-radius: 3px;
+  background-image: url("chrome://global/skin/narrate/back.svg#enabled");
+}
+
+#narrate-skip-next {
+  border-top-right-radius: 3px;
+  background-image: url("chrome://global/skin/narrate/forward.svg#enabled");
+}
+
+#narrate-skip-previous:disabled {
+  background-image: url("chrome://global/skin/narrate/back.svg#disabled");
+}
+
+#narrate-skip-next:disabled {
+  background-image: url("chrome://global/skin/narrate/forward.svg#disabled");
+}
+
+#narrate-start-stop {
+  background-image: url("chrome://global/skin/narrate/start.svg");
+}
+
+#narrate-start-stop.speaking {
+  background-image: url("chrome://global/skin/narrate/stop.svg");
+}
+
+/* Rate control */
+
+#narrate-rate::before, #narrate-rate::after {
+  content: '';
+  width: 48px;
+  height: 40px;
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: 24px auto;
+}
+
+#narrate-rate::before {
+  background-image: url("chrome://global/skin/narrate/slow.svg");
+}
+
+#narrate-rate::after {
+  background-image: url("chrome://global/skin/narrate/fast.svg");
+}
+
+#narrate-rate-input {
+  margin: 0 1px;
+  flex-grow: 1;
+}
+
+#narrate-rate-input::-moz-range-track {
+  background-color: #979797;
+  height: 2px;
+}
+
+#narrate-rate-input::-moz-range-progress {
+  background-color: #2EA3FF;
+  height: 2px;
+}
+
+#narrate-rate-input::-moz-range-thumb {
+  background-color: #808080;
+  height: 16px;
+  width: 16px;
+  border-radius: 8px;
+  border-width: 0;
+}
+
+#narrate-rate-input:active::-moz-range-thumb {
+  background-color: #2EA3FF;
+}
+
+/* Voice selection */
+
+.voiceselect {
+  width: 100%;
+}
+
+.voiceselect > button.select-toggle,
+.voiceselect > .options > button.option {
+  -moz-appearance: none;
+  border: none;
+  width: 100%;
+  min-height: 40px;
+}
+
+.voiceselect.open > button.select-toggle {
+  border-bottom: 1px solid var(--border-color);
+}
+
+.voiceselect > button.select-toggle::after {
+  content: '';
+  background-image: url("chrome://global/skin/narrate/arrow.svg");
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: 12px 12px;
+  display: inline-block;
+  width: 1.5em;
+  height: 1em;
+  vertical-align: middle;
+}
+
+.voiceselect > .options > button.option:not(:first-child) {
+  border-top: 1px solid var(--border-color);
+}
+
+.voiceselect > .options > button.option  {
+  box-sizing: border-box;
+}
+
+.voiceselect > .options:not(.hovering) > button.option:focus {
+  background-color: #eaeaea;
+}
+
+.voiceselect > .options:not(.hovering) > button.option:hover:not(:focus) {
+  background-color: transparent;
+}
+
+.voiceselect > .options > button.option::-moz-focus-inner {
+  outline: none;
+  border: 0;
+}
+
+.voiceselect > .options {
+  display: none;
+  overflow-y: auto;
+}
+
+.voiceselect.open > .options {
+  display: block;
+}
+
+.current-voice {
+  color: #7f7f7f;
+}
+
+.voiceselect:not(.open) > button,
+.option:last-child {
+  border-radius: 0 0 3px 3px;
+}
diff --git a/arc-firefox-theme/chrome/global/reader/RM-Add-24x24.svg b/arc-firefox-theme/chrome/global/reader/RM-Add-24x24.svg
deleted file mode 100644
index 2071381..0000000
--- a/arc-firefox-theme/chrome/global/reader/RM-Add-24x24.svg
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>

-<!-- This Source Code Form is subject to the terms of the Mozilla Public

-   - License, v. 2.0. If a copy of the MPL was not distributed with this

-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">

-  <path fill-rule="evenodd" fill="#808080" d="M12,2C6.477,2,2,6.477,2,12c0,5.523,4.477,10,10,10s10-4.477,10-10 C22,6.477,17.523,2,12,2z M17.714,12.714h-5v5h-1.429v-5h-5v-1.429h5v-5h1.429v5h5V12.714z"/>

-</svg>

diff --git a/arc-firefox-theme/chrome/global/reader/RM-Delete-24x24.svg b/arc-firefox-theme/chrome/global/reader/RM-Delete-24x24.svg
deleted file mode 100644
index 0ed3983..0000000
--- a/arc-firefox-theme/chrome/global/reader/RM-Delete-24x24.svg
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>

-<!-- This Source Code Form is subject to the terms of the Mozilla Public

-   - License, v. 2.0. If a copy of the MPL was not distributed with this

-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">

-  <path fill-rule="evenodd" fill="#808080" d="M12,2C6.477,2,2,6.477,2,12c0,5.523,4.477,10,10,10s10-4.477,10-10 C22,6.477,17.523,2,12,2z M11.286,6.286 M6.286,12.714v-1.429h11.429v1.429H6.286z"/>

-</svg>

diff --git a/arc-firefox-theme/chrome/global/reader/RM-Reading-List-24x24.svg b/arc-firefox-theme/chrome/global/reader/RM-Reading-List-24x24.svg
deleted file mode 100644
index b43a8b8..0000000
--- a/arc-firefox-theme/chrome/global/reader/RM-Reading-List-24x24.svg
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>

-<!-- This Source Code Form is subject to the terms of the Mozilla Public

-   - License, v. 2.0. If a copy of the MPL was not distributed with this

-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">

-  <rect x="8" y="10" fill="#808080" width="14" height="4"/>

-  <rect x="8" y="16" fill="#808080" width="14" height="4"/>

-  <rect x="8" y="4" fill="#808080" width="14" height="4"/>

-  <circle fill="#808080" cx="4" cy="6" r="2"/>

-  <circle fill="#808080" cx="4" cy="12" r="2"/>

-  <circle fill="#808080" cx="4" cy="18" r="2"/>

-</svg>

diff --git a/arc-firefox-theme/chrome/mozapps/aboutNetworking.css b/arc-firefox-theme/chrome/mozapps/aboutNetworking.css
index dbb33a3..2b4a8df 100644
--- a/arc-firefox-theme/chrome/mozapps/aboutNetworking.css
+++ b/arc-firefox-theme/chrome/mozapps/aboutNetworking.css
@@ -23,19 +23,35 @@ body {
   margin-bottom: 0.5em;
 }
 
+#refreshButton {
+  vertical-align: middle;
+}
+
+/** Categories **/
+
 .category {
   cursor: pointer;
+  /* Center category names */
+  display: flex;
+  align-items: center;
 }
 
 .category .category-name {
   pointer-events: none;
 }
 
+#categories hr {
+  border-top-color: rgba(255,255,255,0.15);
+}
+
+/** Warning container **/
+
 /* XXX: a lot of this is duplicated from info-pages.css since that stylesheet
    is incompatible with this type of layout */
 .warningBackground:not([hidden]) {
   display: flex;
 }
+
 .warningBackground {
   flex-direction: column;
   box-sizing: border-box;
@@ -54,7 +70,7 @@ body {
 .title {
   position: relative;
   border-bottom: 1px solid var(--in-content-box-border-color);
-  margin-bottom: 2em;
+  margin-bottom: 1em;
   padding-bottom: 0.5em;
 }
 
@@ -76,12 +92,14 @@ body {
   min-width: 100px;
 }
 
+/** Content area **/
+
 .main-content {
   flex: 1;
 }
 
 .tab {
-  padding: 0.5em;
+  padding: 0.5em 0;
 }
 
 .tab table {
@@ -89,9 +107,10 @@ body {
   width: 100%;
 }
 
-hr {
+th, td, table {
+  border-collapse: collapse;
   border: none;
-  border-bottom: 1px solid var(--in-content-box-border-color);
+  text-align: start;
 }
 
 th {
@@ -99,12 +118,6 @@ th {
   font-size: larger;
 }
 
-th, td, table {
-  border-collapse: collapse;
-  border: none;
-  text-align: start;
-}
-
 td {
   padding-bottom: 0.25em;
   border-bottom: 1px solid var(--in-content-box-border-color);
diff --git a/arc-firefox-theme/chrome/mozapps/extensions/extensions.css b/arc-firefox-theme/chrome/mozapps/extensions/extensions.css
index a8a29b3..333d393 100644
--- a/arc-firefox-theme/chrome/mozapps/extensions/extensions.css
+++ b/arc-firefox-theme/chrome/mozapps/extensions/extensions.css
@@ -7,6 +7,7 @@
 .main-content {
   padding-top: 0;
   -moz-padding-end: 0;
+  padding-bottom: 0;
 }
 
 #nav-header {
@@ -133,6 +134,10 @@
   padding-right: 20px;
 }
 
+button.warning {
+  list-style-image: url("chrome://mozapps/skin/extensions/alerticon-warning.svg");
+}
+
 
 /*** category selector ***/
 
diff --git a/arc-firefox-theme/chrome/mozapps/extensions/newaddon.css b/arc-firefox-theme/chrome/mozapps/extensions/newaddon.css
index 7d6c056..95d59b3 100644
--- a/arc-firefox-theme/chrome/mozapps/extensions/newaddon.css
+++ b/arc-firefox-theme/chrome/mozapps/extensions/newaddon.css
@@ -88,23 +88,25 @@
   margin-bottom: 20px;
 }
 
-#continuePanel,
-#restartPanel {
+#buttonDeck {
   margin-top: 25px;
-  -moz-box-pack: end;
-  -moz-box-align: center;
+  -moz-box-align: stretch;
+  -moz-box-pack: stretch;
 }
 
 #continuePanel {
   -moz-box-pack: end;
+  -moz-box-align: end;
 }
 
-#restartMessage {
-  text-align: right;
+#restartPanel {
+  -moz-box-pack: end;
+  -moz-box-align: stretch;
 }
 
-#restartSpacer {
-  -moz-box-flex: 1;
+#restartPanelButtons {
+  margin-top: 25px;
+  -moz-box-pack: end;
 }
 
 #later {