Place Facebook Chat on Firefox Sidebar:

• Open Mozilla Firefox browser and press Alt key.
• Select bookmarks and select "show all bookmarks"
• A box will open from that select unsorted bookmarks > organise >  new bookmark.
• Again a box will open in that type "facebookchat" in first boxand type "  http://www.facebook.com/presence/popout.php " in second box .
• Click on load this bookmark >add.
• Now again press alt key > view > side bar > bookmarks>.
• Then select facebook chat from the bookmarks in slide bar.
• You are done.Now you will be able to see chat bar on the left side of your Mozilla Firefox Browser.