Facebook Chatbox Goes Berserk

It's the most annoying thing I've seen so far on Facebook.
The new chatbar is possessing the right side on the browser window now in full height! I don't know who had this idea, but it's way too intrusive and looks horrible.

You can close the box, but everyone thought the old box was bad, now look at that.
I hope this is only some kind of test and get reverted asap.