Sidebar for Facebook is described as 'brings Facebook right into your Firefox Sidebar. Get notifications, status and photos from the left sidebar of Firefox instantly' and is an app in the Web Browsers category. There are three alternatives to Sidebar for Facebook for a variety of platforms, including Linux, Mac, Firefox, Windows and Google Chrome. The best alternative is Messenger & Notifier for Facebook, which is free. Other great apps like Sidebar for Facebook are Facebook Notifier (Free, Open Source) and Facebook Status (Free, Open Source).
See your Facebook status (New Friend Requests, Messages and Notifications) on a toolbar. Perfect for those who don't want to keep Facebook open all the time. By clicking on the icon when the status change is shown, you'll be transferred directly to that status page.