Issue 196 - Filters added on first-run are being removed immediately

lib/filterStorage.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 455 matching lines @@
       let callback = function(e, statData)
       {
         if (e || !statData.exists)
         {
           this.firstRun = true;
           this._loading = false;
           FilterNotifier.triggerListeners("load");
 
           TimeLine.leave("FilterStorage.loadFromDisk() read callback done");
         }
-        readFile(sourceFile, 0);
+        else
+          readFile(sourceFile, 0);
       }
 
       if (sourceFile)
         IO.statFile(sourceFile, callback);
       else
         callback(true);
     }
 
     TimeLine.leave("FilterStorage.loadFromDisk() done");
   },
@@ skipping 397 matching lines @@
       Subscription.knownSubscriptions = origKnownSubscriptions;
     }
 
     // Allow events to be processed every now and then.
     // Note: IO.readFromFile() will deal with the potential reentrance here.
     this.linesProcessed++;
     if (this.linesProcessed % 1000 == 0)
       Utils.yield();
   }
 };