title: Customize Firefox background color of the browser between page load
body: <p>I would like to customize the background color of the browser canvas to black as per instructions from <a href="https://support.mozilla.org/en-US/questions/1006290#answer-647667" rel="nofollow">here</a> but it doesn't seem to work for me, I'm using <strong>ChromEdit</strong> to edit the css config.</p>
  
  <p>I would like to change it to black instead of white.</p>
  
  <p><strong>UserChrome.css</strong>:</p>
  
  <pre>browser { background-color: #000 !important; }</pre>
  
  <p>Anyone every tried to do that?</p>