Issue 4612 - enable AA on first run and make automatic adding of any subscription optional

lib/prefs.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 26 matching lines @@
   update_url_devbuild: "https://adblockplus.org/devbuilds/%NAME%/update.json?type=%TYPE%",
   update_last_check: 0,
   update_last_error: 0,
   update_soft_expiration: 0,
   update_hard_expiration: 0,
   currentVersion: "0.0",
   notificationdata: {},
   notificationurl: "https://notification.adblockplus.org/notification.json",
   suppress_first_run_page: false,
   disable_auto_updates: false,
+  first_run_subscription_auto_select: true,
   notifications_ignoredcategories: [],
 };
 
-let preconfigurable = ["suppress_first_run_page", "disable_auto_updates"];
+let preconfigurable = ["suppress_first_run_page", "disable_auto_updates",
+  "first_run_subscription_auto_select"];
 
 let values;
 let path = _fileSystem.resolve("prefs.json");
 let listeners = [];
 let isDirty = false;
 let isSaving = false;
 
 function defineProperty(key)
 {
   Object.defineProperty(Prefs, key,
@@ skipping 81 matching lines @@
     defaults[key] = _preconfiguredPrefs[key];
 
 // Define defaults
 for (let key in defaults)
   defineProperty(key);
 
 // Set values of prefs based on defaults
 values = Object.create(defaults);
 
 load();