Issue 6440 - Use long-lived connections to listen to extension events

mobile-options.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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 393 matching lines @@
           case "title":
             // We're also receiving these messages for subscriptions that are
             // not installed so we shouldn't add those by accident
             setSubscription(subscription, "update");
             break;
         }
         break;
       }
     }
   }
-  ext.onMessage.addListener(onMessage);
 
-  browser.runtime.sendMessage({
+  let port = browser.runtime.connect({name: "ui"});
+  port.onMessage.addListener(onMessage);
+
+  port.postMessage({
     type: "app.listen",
     filter: ["addSubscription", "showPageOptions"]
   });
 
-  browser.runtime.sendMessage({
+  port.postMessage({
     type: "filters.listen",
     filter: ["added", "removed"]
   });
 
-  browser.runtime.sendMessage({
+  port.postMessage({
     type: "subscriptions.listen",
     filter: ["added", "disabled", "removed", "title"]
   });
 
   /* Initialization */
 
   populateLists();
 
   getDocLink("acceptable_ads", (link) =>
   {
     get("#acceptableAds-more").href = link;
   });
 
   get("#dialog-subscribe [name='title']").setAttribute(
     "placeholder",
     getMessage("mops_subscribe_title")
   );
 
   get("#dialog-subscribe [name='url']").setAttribute(
     "placeholder",
     getMessage("mops_subscribe_url")
   );
 }