Detect and handle the case of our own typo correction extension being installed in parallel

lib/main.js

 /*
  * This Source Code is subject to the terms of the Mozilla Public License
  * version 2.0 (the "License"). You can obtain a copy of the License at
  * http://mozilla.org/MPL/2.0/.
  */
 
 /**
  * @fileOverview Starts up Adblock Plus
  */
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 
 let {TimeLine} = require("timeline");
 
 TimeLine.enter("Adblock Plus startup");
-let {Prefs} = require("prefs");
-TimeLine.log("Done loading preferences");
 registerPublicAPI();
 TimeLine.log("Done registering public API");
 require("filterListener");
 TimeLine.log("Done loading filter listener");
 require("contentPolicy");
 TimeLine.log("Done loading content policy");
 require("synchronizer");
 TimeLine.log("Done loading subscription synchronizer");
 require("sync");
 TimeLine.log("Done loading sync support");
 require("ui");
 TimeLine.log("Done loading UI integration code");
-if (!Prefs.correctTyposAsked || (Prefs.correctTyposAsked && Prefs.correctTypos))
-{
-  require("typoFixer");
-  TimeLine.log("Done loading typo correction");
-}
-else
-{
-  let onPrefChange = function(name)
-  {
-    if (name == "correctTypos")
-    {
-      require("typoFixer");
-      Prefs.removeListener(onPrefChange);
-    }
-  }
-  
-  Prefs.addListener(onPrefChange);
-}
+require("typoBootstrap");
+TimeLine.log("Done loading typo correction");
 TimeLine.leave("Started up");
 
 function registerPublicAPI()
 {
   let {addonRoot} = require("info");
 
   let uri = Services.io.newURI(addonRoot + "lib/Public.jsm", null, null);
   if (uri instanceof Ci.nsIMutable)
     uri.mutable = false;
 
@@ skipping 12 matching lines @@
 
   let registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
   registrar.registerFactory(classID, "Adblock Plus public API URL", contractID, factory);
 
   onShutdown.add(function()
   {
     registrar.unregisterFactory(classID, factory);
     Cu.unload(uri.spec);
   });
 }