Get the classic sidebar on Facebook
The original facebook sidebar was OK. It showed you who was online and allowed you to chat with them. The new 2011 version just pops up apparently random people (well, those with whom you have recently corresponded).
Plus you don't get to see everyone who is online. Many people are disappointed and angry at this apparent retrograde step.
But fret no longer. Help is at hand with the Greasemonkey-based Firefox extension, Facebook Chat Enhancer
The Lowdown..
Facebook Chat Enhancer is a realtime script for the Firefox web browser that modifies the Facebook sidebar to indicate only people who are currently on line.
You will also need to install the Greasemonkey plug-in. Don't worry, the whole thing will be fixed in an instant..