Functional prefs implementation

lib/init.js

Index: lib/init.js
===================================================================
--- a/lib/init.js
+++ b/lib/init.js
@@ -1,8 +1,26 @@
+var _prefsInitDone = false;
+var _filtersInitDone = false;
+
+require("prefs").Prefs._initListener = function()
+{
+  _prefsInitDone = true;
+  _checkInitialized();
+};
+
+function _checkInitialized()
+{
+  if (_prefsInitDone && _filtersInitDone)
+  {
+    _checkInitialized = function() {};
+    _triggerEvent("init");
+  }
+}
+
 require("filterNotifier").FilterNotifier.addListener(function(action)
 {
   if (action === "load")
   {
     let {FilterStorage} = require("filterStorage");
     if (FilterStorage.subscriptions.length == 0)
     {
       // No data, must be a new user or someone with corrupted data - initialize
@@ -22,11 +40,12 @@ require("filterNotifier").FilterNotifier
         subscription.disabled = false;
         subscription.title = node.title;
         subscription.homepage = node.homepage;
         if (subscription instanceof DownloadableSubscription && !subscription.lastDownload)
           Synchronizer.execute(subscription);
       }
     }
 
-    _triggerEvent("init");
+    _filtersInitDone = true;
+    _checkInitialized();
   }
 });