MySocial 24x7 is a Firefox browser plugin that allows users to access the core functionality of FriendFeed from the browser sidebar. It launched in April 2008 and is built on Google App Engine.
I've seen many of Sandosh's previous avatars, and I'm sure that this would like up to the name created by many such. Simple to use tool, and extremely user-friendly. A must-have with FriendFeed.