Added Safari Support

webrequest.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 125 matching lines @@
     var frameUrl = frameData.url;
     var parentUrl = (parentData ? parentData.url : frameUrl);
     if ("keyException" in frameData || isWhitelisted(frameUrl, parentUrl, type))
       return true;
   }
   return false;
 }
 
 ext.webRequest.onBeforeRequest.addListener(onBeforeRequest, ["http://*/*", "https://*/*"]);
 
-if ('chrome' in window)
+if (require("info").platform == "chromium")
 {
   function onHeadersReceived(details)
   {
     if (details.tabId == -1)
       return;
 
     var type = details.type;
     if (type != "main_frame" && type != "sub_frame")
       return;
 
     var tab = new Tab({id: details.tabId});
     var url = getFrameUrl(tab, details.frameId);
     if (url != details.url)
       return;
 
     var key = null;
     var signature = null;
     for (var i = 0; i < details.responseHeaders.length; i++)
     {
       var header = details.responseHeaders[i];
       if (header.name.toLowerCase() == "x-adblock-key" && header.value)
       {
         var index = header.value.indexOf("_");
         if (index >= 0)
         {
-          var key = header.value.substr(0, index);
-          var signature = header.value.substr(index + 1);
+          key = header.value.substr(0, index);
+          signature = header.value.substr(index + 1);
           break;
         }
       }
     }
     if (!key)
       return;
 
     var parentUrl = null;
     if (type == "sub_frame")
       parentUrl = getFrameUrl(tab, details.parentFrameId);
@@ skipping 14 matching lines @@
         host,                         // HTTP_HOST
         window.navigator.userAgent    // HTTP_USER_AGENT
       ];
       if (verifySignature(key, signature, params.join("\0")))
         frames.get(tab)[details.frameId].keyException = true;
     }
   }
 
   chrome.webRequest.onHeadersReceived.addListener(onHeadersReceived, {urls: ["http://*/*", "https://*/*"]}, ["responseHeaders"]);
 }