Issue 3801 - Add pre-configurable preference for additional subscriptions

lib/subscriptionInit.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 84 matching lines @@
 
 /**
  * Gets the filter subscriptions to be added when the extnesion is loaded.
  *
  * @return {Promise|Subscription[]}
  */
 function getSubscriptions()
 {
   let subscriptions = [];
 
+  // Add pre-configured subscriptions
+  for (let url of Prefs.additional_subscriptions)
+    subscriptions.push(Subscription.fromURL(url));
+
   // Add "acceptable ads" and "anti-adblock messages" subscriptions
   if (firstRun)
   {
     let acceptableAdsSubscription = Subscription.fromURL(
       Prefs.subscriptions_exceptionsurl
     );
     acceptableAdsSubscription.title = "Allow non-intrusive advertising";
     subscriptions.push(acceptableAdsSubscription);
 
     let antiAdblockSubscription = Subscription.fromURL(
@@ skipping 70 matching lines @@
  * Sets a callback that is called with an array of subscriptions to be added
  * during initialization. The callback must return an array of subscriptions
  * that will effectively be added.
  *
  * @param {function}
  */
 exports.setSubscriptionsCallback = function(callback)
 {
   subscriptionsCallback = callback;
 };