Yep, It's already released. I've just downloaded it .

Personally, I'm still love the old theme. So I go to firefox and grab the old theme.

First impression was, this browser is awesome. Restarting the browser will never make us start to browse from the scrath. For example, if your computer power is suddenly shut down, you don't have to worry about the tabs. Firefox will automatically start with all tabs which are previously opened. For user using tab feature extensively like me, this feature is awesome. I usually open many tabs. Thanks to firefox that makes my life easier.