title: Unable to handle the authenication dialog in firefox using selenlum webdriver
body: <p>When I try to launch any URL a proxy authentication dialog pops up for username and password. The code (java)  stops once the dialog appears and doesn't move further or throw an exception. 
  How can i handle this?</p>
  
  <p>Note: This is happening only with firefox(v 22.0). I am able to handle the authentication dialog in IE(v 7) using the Robot send keys.</p>
  
  <p>Webdriver: selenium-server-standalone-2.35.0
  Firefox version : 22.0
  testNG version: 6.8.7</p>