title: Firefox addon,javascript, stop HTTP/DNS request
body: <p>I have this simple piece of code in my JS file:</p>
  
  <pre><code>AdultURL_FilterUrl = second_node.getElementsByTagName('filterdomain')[0].firstChild.nodeValue;
                      window.stop();
  </code></pre>
  
  <p>Which basically checks if the URL (is on and) equals the adultURL blocklist, and stops the window from loading.<br>
  But is there anyway to stop the http request so that it does not register on the adult site?  </p>
  
  <p>Even better if it is possible to stop it before the DNS request is sent.</p>