Added Safari Support

utils.js

-var backgroundPage = chrome.extension.getBackgroundPage();
+var backgroundPage = ext.backgroundPage.getWindow();
 var require = backgroundPage.require;
 
+var Services = backgroundPage.Services;
 var Synchronizer = require("synchronizer").Synchronizer;
 var Utils = require("utils").Utils;
 var Prefs = require("prefs").Prefs;
 var FilterStorage = require("filterStorage").FilterStorage;
 var FilterNotifier = require("filterNotifier").FilterNotifier;
 
 var subscriptionClasses = require("subscriptionClasses");
 var Subscription = subscriptionClasses.Subscription;
 var DownloadableSubscription = subscriptionClasses.DownloadableSubscription;
 var filterClasses = require("filterClasses");
 var Filter = filterClasses.Filter;
 var BlockingFilter = filterClasses.BlockingFilter;
 var defaultMatcher = require("matcher").defaultMatcher;
 
 /**
  * Shortcut for document.getElementById(id)
  */
 function E(id)
 {
   return document.getElementById(id);
 }