It works much like the standard status bar, but adds a Search field and a handy "Share this page" button (useful for sharing any page that doesn't have its own Facebook button). My only complaint is that when you click, say, the message or notification icon, it opens a new Facebook tab rather than a pop-up showing the actual content.

That said, you can scroll through status updates by clicking the up/down arrows, which is definitely nice. As something a Facebook junkie myself, I'm liking this add-on a lot.