Don't delay Firefox startup

lib/utils.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 347 matching lines @@
             selectedItem = subscription;
             selectedPrefix = prefix;
           }
         }
       }
     }
     return selectedItem;
   },
 
   /**
+   * Pauses code execution and allows events to be processed. Warning:
+   * other extension code might execute, the extension might even shut down.
+   */
+  yield: function()
+  {
+    let thread = Services.tm.currentThread;
+    while (thread.processNextEvent(false));
+  },
+
+  /**
    * Saves sidebar state before detaching/reattaching
    */
   setParams: function(params)
   {
     sidebarParams = params;
   },
 
   /**
    * Retrieves and removes sidebar state after detaching/reattaching
    */
@@ skipping 384 matching lines @@
     Cu.reportError(e);
     // Expected, ctypes isn't supported in Gecko 1.9.2
     return null;
   }
 });
 
 if ("@mozilla.org/messenger/headerparser;1" in Cc)
   XPCOMUtils.defineLazyServiceGetter(Utils, "headerParser", "@mozilla.org/messenger/headerparser;1", "nsIMsgHeaderParser");
 else
   Utils.headerParser = null;