1 files changed, 19 insertions, 2 deletions
diff --git a/src/content/embeddingDocument.js b/src/content/embeddingDocument.js
index eed04b1..bc1b97f 100644
--- a/src/content/embeddingDocument.js
+++ b/src/content/embeddingDocument.js
@@ -1,5 +1,5 @@
 if (ns.embeddingDocument) {
-  ns.on("capabilities", () => {
+  let replace = () => {
     for (let policyType of ["object", "media"]) {
       let request = {
         id: `noscript-${policyType}-doc`,
@@ -8,7 +8,7 @@ if (ns.embeddingDocument) {
         documentUrl: document.URL,
         embeddingDocument: true,
       };
-      
+
       if (ns.allows(policyType)) {
         let handler = PlaceHolder.handlerFor(policyType);
         if (handler && handler.selectFor(request).length > 0) {
@@ -19,9 +19,26 @@ if (ns.embeddingDocument) {
         if (ph.replacements.size > 0) {
           debug(`Created placeholder for ${policyType} at ${document.URL}`);
           seen.record({policyType, request, allowed: false});
+        }
+      }
+    }
+  };
+  ns.on("capabilities", () => {
+    if (!document.body.firstChild) { // we've been called early
+      setTimeout(replace, 0);
+      let types = {
+        "media": /^(?:video|audio)\//i,
+        "object": /^application\//i,
+      }
+      for (let [type, rx] of Object.entries(types)) {
+        if (rx.test(document.contentType) && !ns.allows(type)) {
+          window.stop();
           break;
         }
       }
+
+    } else {
+      replace();
     }
   });
 }