Got rid of classList.toggle() with second argument for compatibility with Safari

popup.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 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 48 matching lines @@
 
   // Ask content script whether clickhide is active. If so, show cancel button.
   // If that isn't the case, ask background.html whether it has cached filters. If so,
   // ask the user whether she wants those filters.
   // Otherwise, we are in default state.
   ext.windows.getLastFocused(function(win)
   {
     win.getActiveTab(function(t)
     {
       tab = t;
-      document.getElementById("enabled").classList.toggle("off", isWhitelisted(tab.url));
+      if (isWhitelisted(tab.url))
+        document.getElementById("enabled").classList.add("off");
 
       tab.sendMessage({type: "get-clickhide-state"}, function(response)
       {
-        document.body.classList.toggle("clickhide-active", response && response.active);
+        if (response && response.active)
+          document.body.classList.add("clickhide-active");
       });
     });
   });
 }
 window.addEventListener("DOMContentLoaded", init, false);
 
 function toggleEnabled()
 {
   var enabledButton = document.getElementById("enabled")
   var disabled = enabledButton.classList.toggle("off");
@@ skipping 44 matching lines @@
   document.body.classList.remove("clickhide-active");
   tab.sendMessage({type: "clickhide-deactivate"});
 }
 
 function toggleCollapse(event)
 {
   var collapser = event.currentTarget;
   Prefs[collapser.dataset.option] = !Prefs[collapser.dataset.option];
   collapser.parentNode.classList.toggle("collapsed");
 }