I have quite a few Add-ons, I think they're all pretty useful.
FireGesture
Executes Various Commands with your mouse
Session Manager
Saves and Restores the State of all windows(meaning if I'm researching something I can save all the Tabs I have open as a session)
Speed Dial
Direct Access to my most visited Websites
Stylish
you can Change the CSS or layout on any webpage to your liking, Youtube is all dark colors for me.
