Issue 5587, 5748 - Use mobile options page on Firefox for Android

lib/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 41 matching lines @@
     callback(new ext.Page(optionsTab));
   }
   else
   {
     // If we don't already have an options page, it means we've just opened
     // one, in which case we must find the tab, wait for it to be ready, and
     // then return the call.
     findOptionsTab(tab =>
     {
       if (!tab)
-      {
-        // This likely means that there was an error.
         return;
-      }
 
       function onMessage(message, sender)
       {
         if (message.type == "app.listen" &&
             sender.page && sender.page.id == tab.id)
         {
           port.off("app.listen", onMessage);
           callback(new ext.Page(tab));
         }
       }
@@ skipping 70 matching lines @@
         args: [
           {
             host: getDecodedHostname(currentPage.url).replace(/^www\./, ""),
             whitelisted: !!checkWhitelisted(currentPage)
           }
         ]
       });
     });
   });
 });