Added workaround for missing safari object in frames with javascript: URL

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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 (function()
 {
+  // the safari object is missing in frames created from javascript: URLs.
+  // So we have to fallback to the safari object from the parent frame.
+  if (!("safari" in window))
+    window.safari = window.parent.safari;
+
   if (window == window.top)
     safari.self.tab.dispatchMessage("loading");
 
 
   /* Events */
 
   var ContentMessageEventTarget = function()
   {
     MessageEventTarget.call(this, safari.self);
   };
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   // 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);
 })();