Extensions:
SpellBound
Tabbrowser Preferences
MAB - Mozilla Amzon Browser
NoScript - WhiteList Sites to allow JavaScript
SomethingAwful Last Read - Get this if your an SA forums member.
Muke Anything - Right click and remove any item current page load only
NextPlease - Gives next page on just about every forums site I use
DownThemAll! - List all items (images, archives, etc...) on a page and allows you to download any of them
CustomizeGoogle - SSL Gmail, Allows use Google Suggest, Remove Google ADS, etc...


Themes:
708090
Noia 2.0 (eXtreame)


Edited: Forgot CustomizeGoogle