Trick to Facebook chat in Firefox Sidebar

In this trick you can chat with your facebook friends, while browsing to other sites.
Steps

• First you go to http://www.facebook.com/presence/popout.php
• Check the Load This Bookmark In Sidebar box
• Then click View->Sidebar->Bookmarks in Firefox to open the sidebar bookmarks
• Select the bookmarked page and you are done
• You can now browse any sites while chatting with your friends!