Enable Facebook Chat in Firefox’s sidebar

if you dont like to keep your facebook window open and you like to chat with friends......then there is a possibility...check this stuff

» Right-click on Firefox Bookmarks toolbar > New Bookmark

» In the window that appears, enter the values-

• Name: Facebook Chat
• Location: http://www.facebook.com/presence/popout.php
• ‘Load this bookmark in the sidebar’ checkbox: CHECKED

» Now click the newly created ‘Facebook Chat’ bookmark by clicking its button in the bookmarks toolbar. This will open Facebook chat in Firefox’s sidebar.