Refactored the abstraction layer to address prerendered pages on Safari caused by leaky abstraction

notification.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 70 matching lines @@
 
   messageElement.addEventListener("click", function(event)
   {
     var link = event.target;
     while (link && link !== messageElement && link.localName !== "a")
       link = link.parentNode;
     if (!link)
       return;
     event.preventDefault();
     event.stopPropagation();
-    ext.windows.getLastFocused(function(win) { win.openTab(link.href); });
+    ext.pages.open(link.href);
   });
 
   if (notification.type == "question")
   {
     document.getElementById("notification-question").addEventListener("click", function(event)
     {
       event.preventDefault();
       event.stopPropagation();
       
       var approved = false;
@@ skipping 14 matching lines @@
   var notificationElement = document.getElementById("notification");
   notificationElement.className = notification.type;
   notificationElement.style.display = "block";
   
   document.getElementById("close-notification").addEventListener("click", function()
   {
     notificationElement.style.display = "none";
     notification.onClicked();
   }, false);
 }, false);