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

iconAnimation.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 32 matching lines @@
   {
     this._icons.set(page, icon);
 
     if (this._animatedPages.has(page))
       this._updateIcon(page);
   },
   _start: function()
   {
     this._interval = setInterval(function()
     {
-      ext.pages.query({active: true, visibleWindow: true}, function(pages)
+      ext.pages.query({active: true}, function(pages)
       {
         if (pages.length == 0)
           return;
 
         for (var i = 0; i < pages.length; i++)
           this._animatedPages.set(pages[i], null);
 
         var interval = setInterval(function()
         {
           this._step++;
@@ skipping 34 matching lines @@
 
       if (this._step < 10)
         suffix += "-" + this._step;
 
       path = path.replace(/(?=\..+$)/, suffix);
     }
 
     page.browserAction.setIcon(path);
   }
 };