Use Shadow DOM for element hiding

background.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 465 matching lines @@
     }
   }
   prepareNotificationIconAndPopup();
 }
 
 ext.onMessage.addListener(function (msg, sender, sendResponse)
 {
   switch (msg.type)
   {
     case "get-selectors":
-      var selectors = null;
+      var selectors = [];
 
       if (!isFrameWhitelisted(sender.page, sender.frame, "DOCUMENT") &&
           !isFrameWhitelisted(sender.page, sender.frame, "ELEMHIDE"))
       {
         var noStyleRules = false;
         var host = extractHostFromURL(sender.frame.url);
         for (var i = 0; i < noStyleRulesHosts.length; i++)
         {
           var noStyleHost = noStyleRulesHosts[i];
           if (host == noStyleHost || (host.length > noStyleHost.length &&
@@ skipping 81 matching lines @@
   page.sendMessage({type: "clickhide-deactivate"});
   refreshIconAndContextMenu(page);
 });
 
 setTimeout(function()
 {
   var notificationToShow = Notification.getNextToShow();
   if (notificationToShow)
     showNotification(notificationToShow);
 }, 3 * 60 * 1000);