title: Mozilla FB Container not auto enabled
body: <p>I installed the <a href="https://addons.mozilla.org/en-US/firefox/addon/facebook-container/" rel="nofollow noreferrer">Mozilla Facebook Container</a> Add-on and as per the instructions: </p>
  
  <blockquote>
    <p>Installing this extension deletes your Facebook cookies and logs you
    out of Facebook. The next time you navigate to Facebook it will load
    in a new blue colored browser tab (the “Container”).</p>
  </blockquote>
  
  <p>This, however, did not work for me. 
  <a href="https://i.stack.imgur.com/8Aaor.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8Aaor.png" alt="FB Tab"></a></p>
  
  <p>I have the Add-on installed:
  <a href="https://i.stack.imgur.com/Qd4zs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Qd4zs.png" alt="enter image description here"></a></p>
  
  <p>Is there a step that I need to take that is not documented?</p>