Mozilla Links discovered a nifty trick for adding Facebook chat to your browser sidebar in Firefox. All you have to do is click on your bookmark toolbar and create a new bookmark. Give it whatever name you like, and enter this for the URL:
http://www.facebook.com/presence/popout.php
Make sure to select the button that says "Load this bookmark in the sidebar" and you should be all set.
Note that you can drag the sidebar divider to make the Facebook Chat window larger or smaller. If all you want to do is see your contact list, the sidebar doesn't take up much space as all. But if you want to actually open a chat window with one or more of your contacts, you'll need to widen the sidebar a bit, which will cost you some valuable web browser real estate.
Facebook Chat isn't the only instant messenger you can open in a Firefox sidebar. You can also create bookmarks for Google Talk and Meebo.
