The Facebook Toolbar for Firefox is a free extension for Firefox 2.0 that lets you extend your Facebook experience into your everyday browsing.
The Search Box allows you to easily search Facebook no matter where you are. Select a friend from the dropdown to go directly to their profile, or hit "enter" to see the search results.
Icons on the toolbar tell you how many new pokes, friend requests, messages, event invitations, and group invitations you have.
A pop-up will notify you when your friends update their statuses and profiles, upload new photos, write new notes, or interact with you on Facebook.
Click the icon to open the Facebook friends sidebar and check out your friends' profile pictures and statuses, along with convenient links for interacting with them on Facebook. You can sort your friends by name or by how recently they updated their status or profile.
The Share button lets you share the page that you are currently browsing by sending it to friends or posting it to your profile.