Facebook™ Messenger lets you bring a Facebook Messenger right into your browser to chat with your friends.
You should see a Facebook™ Messenger sidebar right side of the Firefox interface. Please login Facebook™ to start using Facebook™ Messenger. The sidebar will remain open and you will be able to see the online status of your friends and chat with them instantly without leaving your web experience.
Facebook™ Messenger is a helper tool for Facebook™ users. Facebook™ Messenger is not officially affiliated with Facebook™ or any Facebook™ products. Facebook™ is a registered trademark Facebook Inc.
The outage on Facebook has been fixed currently (1.3.2013)