Issue 3814 - Opening sharing pop-up fails starting with Firefox 47

common.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 55 matching lines @@
 
     // Firefox 38+ no longer allows messaging using postMessage so we need
     // to have a fake top level frame to avoid problems with scripts that try to
     // communicate with the first-run page
     var isGecko = ("Components" in window);
     if (isGecko)
     {
       try
       {
         var Ci = Components.interfaces;
-        iframe.contentWindow
+        var docShell = iframe.contentWindow
           .QueryInterface(Ci.nsIInterfaceRequestor)
-          .getInterface(Ci.nsIDocShell)
-          .setIsBrowserInsideApp(Ci.nsIScriptSecurityManager.UNKNOWN_APP_ID);
+          .getInterface(Ci.nsIDocShell);
+
+        if (typeof docShell.frameType != "undefined")
+        {
+          // Gecko 47+
+          docShell.frameType = docShell.FRAME_TYPE_BROWSER;
+        }
+        else
+        {
+          // Legacy branch
+          docShell.setIsBrowserInsideApp(Ci.nsIScriptSecurityManager.UNKNOWN_APP_ID);
+        }
       }
       catch(ex)
       {
         console.error(ex);
       }
     }
 
     var popupMessageReceived = false;
     function resizePopup(width, height)
     {
@@ skipping 47 matching lines @@
       }
 
       iframe.removeEventListener("load", popupLoadListener);
     };
     iframe.addEventListener("load", popupLoadListener, false);
 
     iframe.src = url;
     glassPane.className = "visible";
   }
 })(this);