title: Android Firefox 38 pageWorker don't work
body: <p>I develop an extension for mobile version (as Android version) of Firefox borwser. I use <a href="https://developer.mozilla.org/en-US/Add-ons/SDK/High-Level_APIs/page-worker" rel="nofollow">sdk/page-worker</a> high-level api for create a background page for connect with WebSocket server. But when I updated my Firefox to 38 version, page-worker dont'work!
  In example I have a next source:</p>
  
  <pre><code>var pageWorker = require("sdk/page-worker");
  var tmp = pageWorker.Page({
       contentScript: 'console.log("Im loaded!!");'
  });
  </code></pre>
  
  <p>It was work on older version of Firefox (etc 37).</p>
  
  <p>But it don't work only in mobile version of Firefox. On desktop Firefox 38 page-worker is work.</p>
  
  <p>It's a bug or a new feature? Thanks!</p>