Deal with preloadded pages in Safari 7.0

safari/ext/content.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 37 matching lines @@
   };
 
 
   /* Background page proxy */
   var proxy = {
     objects: [],
     callbacks: [],
 
     send: function(message)
     {
-      evt = document.createEvent("Event");
+      var evt = document.createEvent("Event");
       evt.initEvent("beforeload");
       return safari.self.tab.canLoad(evt, {type: "proxy", payload: message});
     },
     checkResult: function(result)
     {
       if (!result.succeed)
         throw result.error;
     },
     deserializeResult: function(result)
     {
@@ skipping 375 matching lines @@
   // so we need to add it to the event's user info.
   document.addEventListener("contextmenu", function(event)
   {
     var element = event.srcElement;
     safari.self.tab.setContextMenuEventUserInfo(event, {
       srcUrl: ("src" in element) ? element.src : null,
       tagName: element.localName
     });
   }, false);
 })();