Bug 1483240 - Disable plugins in recording/replaying processes, r=jimm.

--HG--
extra : rebase_source : 342a8a0b55affc43858e9cba231888af4411892e

dom/plugins/base/nsPluginHost.cpp

@@ -793,6 +793,12 @@ nsPluginHost::InstantiatePluginInstance(const nsACString& aMimeType, nsIURI* aUR
     return NS_ERROR_FAILURE;
   }
 
+  // Plugins are not supported when recording or replaying executions.
+  // See bug 1483232.
+  if (recordreplay::IsRecordingOrReplaying()) {
+    return NS_ERROR_FAILURE;
+  }
+
   RefPtr<nsPluginInstanceOwner> instanceOwner = new nsPluginInstanceOwner();
   if (!instanceOwner) {
     return NS_ERROR_OUT_OF_MEMORY;