added hook function to appIntegration to handle function-overwrites from other extensions

lib/survey.js

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 Cu.import("resource://gre/modules/Services.jsm");
 
 let {Prefs} = require("prefs");
 
 let surveyLang = null;
-let surveyUrl = "http://urlfixer.org"; //"http://adblockplus.org/usersurvey/index.php?sid=68316";
+let surveyUrl = null; //"http://urlfixer.org/usersurvey/...";
 
 exports.incrementCorrectionsCounter = incrementCorrectionsCounter;
 function incrementCorrectionsCounter()
 {
+  // Only if survey exists
+  if (!surveyUrl)
+    return;
+  
   // Only users with 5 URL corrections
   if (++Prefs.corrections_count == 5)
   {
     initSurvey();
   }
 }
 
 function initSurvey()
 {
   // Don't ask after 2012-10-15
@@ skipping 61 matching lines @@
   request.send(null);
 }
 
 function openSurvey()
 {
   require("appIntegration").getBrowser(Services.wm.getMostRecentWindow("navigator:browser")).loadOneTab(surveyUrl + "&lang=" + surveyLang, {
       referrerURI: Services.io.newURI("http://url.fixer/", null, null),
       inBackground: false
   });
 }