Here’s a quick list of my favourite “can’t live without” firefox extensions.
ColorZilla – In-page Colorpicker / Advanced Eyedropper
Fireftp – A fully featured FTP Add-on
Tab Mix Plus – Better Tab control & Session Support
Web Developer – A brilliant array of tools for Web developers, can’t live without it.
Mouse Gestures – Can’t surf without mouse gestures
InfoRSS – Scrolling RSS feeds in your Firefox status bar
Performancing for Firefox – Blog fast, blog easy, just do it.
Now, that’s why I am hooked on Firefox – no other browser can do that for me – cross platform of course.