Issue 3826 - Filter preference change events

lib/stats.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 40 matching lines @@
   // Update number in icon
   if (Prefs.show_statsinicon)
   {
     page.browserAction.setBadge({
       color: badgeColor,
       number: blocked
     });
   }
 });
 
-Prefs.onChanged.addListener(function(name)
+Prefs.on("show_statsinicon", function()
 {
-  if (name != "show_statsinicon")
-    return;
-
   ext.pages.query({}, function(pages)
   {
     for (var i = 0; i < pages.length; i++)
     {
       let page = pages[i];
       let badge = null;
 
       if (Prefs.show_statsinicon)
       {
         let blocked = blockedPerPage.get(page);
         if (blocked)
         {
           badge = {
             color: badgeColor,
             number: blocked
           };
         }
       }
 
       page.browserAction.setBadge(badge);
     }
   });
 });