facebook-chat-firefox

Like Google Talk, you can also run the Facebook Chat application from Firefox sidebar.

The advantages are that you need not open your Facebook homepage to see a list of friends that are online and second, you can talk with Facebook friends while reading any web page in Firefox.

firefox-sidebar To run the Facebook chat messenger from Firefox sidebar, press Ctrl+Shift+B to open the Bookmarks Organizer.

Now go to Organize -> New Bookmark and type the following address:

http://www.facebook.com/presence/popout.php

Also tick the check-box the says "Load this bookmark in the sidebar". You may save this under "Bookmarks Toolbar" so you can open Facebook chat window in a single click.

You can do something similar in Opera – Press F4 to open the Opera sidebar and drag the above Facebook link onto that Opera Sidebar.

Related: Add iGoogle to Firefox Sidebar