Added Safari Support

popupBlocker.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/>.
  */
 
-if ("webNavigation" in chrome)
+if ("chrome" in window && "webNavigation" in chrome)
 {
   var tabsLoading = {};
 
   chrome.webNavigation.onCreatedNavigationTarget.addListener(function(details)
   {
     if (isFrameWhitelisted(details.sourceTabId, details.sourceFrameId))
       return;
 
     var openerUrl = getFrameUrl(details.sourceTabId, details.sourceFrameId);
     if (!openerUrl)
@@ skipping 24 matching lines @@
 
 function checkPotentialPopup(tabId, url, opener)
 {
   var requestHost = extractHostFromURL(url);
   var documentHost = extractHostFromURL(opener);
   var thirdParty = isThirdParty(requestHost, documentHost);
   var filter = defaultMatcher.matchesAny(url || "about:blank", "POPUP", documentHost, thirdParty);
   if (filter instanceof BlockingFilter)
     chrome.tabs.remove(tabId);
 }