Issue 384 - Wrong image shows up briefly for Adblock Plus icon

lib/appSupport.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 346 matching lines @@
       {
         let browser = exports.getBrowser(window);
         return (browser ? browser.currentURI : null);
       }
     };
 
     exports.contentContextMenu = ["contentAreaContextMenu", "mailContext"];
 
     exports.defaultToolbarPosition = {
       parent: ["PersonalToolbar", "msgToolbar"],
-      before: ["bookmarks-button", "button-junk"]
+      before: ["bookmarks-button", "button-junk"],
+      addClass: "toolbarbutton-1"
     };
 
     exports.statusbarPosition = {
       parent: "status-bar"
     };
 
     exports.toolsMenu = {
       parent: "taskPopup",
       after: "downloadmgr"
     };
@@ skipping 561 matching lines @@
             event.state = {id: require("info").addonID};
             browser._contentWindow.dispatchEvent(event);
           });
         });
       }, true);
     };
 
     break;
   }
 }