How to restore back to original facebook chat

 
For Mozilla Firefox users :

• First install grease monkey , https://addons.mozilla.org/en-US/firefox/addon/greasemonkey

 

• Then install this script http://userscripts.org/scripts/source/107159.user.js . 

  For CHROME users :

• Just  install this script http://tinyurl.com/3ckhj5d

Then restart your browser and enjoy the chat.

You also try https://www.facebook.com/presence/popout.php if you don’t want to install any script.