
Steps to place Facebook chat on sidebar :
Step 1. Open Firefox, go to Bookmarks and then select Organize Bookmarks
Step 2. Click on new Bookmark tab and enter the following:
Step 3 . Name: Facebook Chat
Location: http://www.facebook.com/presence/popout.php
Check Load this bookmark in sidebar.

Now You can open the "Facebook Chat" in sidebar, click Facebook Chat and start chatting with your Facebook friends while you do your work.
Keep Smiling
:-)