2 files changed, 6 insertions, 5 deletions
diff --git a/src/xss/InjectionChecker.js b/src/xss/InjectionChecker.js
index 52cba27..a09938b 100644
--- a/src/xss/InjectionChecker.js
+++ b/src/xss/InjectionChecker.js
@@ -107,11 +107,10 @@ XSS.InjectionChecker = (async () => {
       var bs = {
         nq: new RegExp("[" + def + "]")
       };
-      Array.forEach("'\"`", // special treatment for quotes
-        function(c) {
-          bs[c] = new RegExp("[" + def + c + "]");
-        }
-      );
+      for (let c of ['"', '"', '`']) {
+        // special treatment for quotes
+        bs[c] = new RegExp("[" + def + c + "]");
+      }
       delete this.breakStops;
       return (this.breakStops = bs);
     },
diff --git a/src/xss/XSS.js b/src/xss/XSS.js
index 18630fa..9c2fca3 100644
--- a/src/xss/XSS.js
+++ b/src/xss/XSS.js
@@ -113,6 +113,8 @@ var XSS = (() => {
 
   return {
     async start() {
+      if (!UA.isMozilla) return; // async webRequest is supported on Mozilla only
+
       let {onBeforeRequest} = browser.webRequest;
       let  {xssScanRequestBody} = ns.sync;
       if (xssScanRequestBody !== this.xssScanRequestBody) {