What I love about Mozilla Firefox is all the great extensions for it.  Here are my favorites…

DOM Inspector*
Dictionary Search
IE View*
Nuke Anything
wmlbrowser
Clone Window*
Adblock*
Web Developer*
Image Zoom*
Tabbrowser Preferences
Yahoo Toolbar*
BlogJetThis!
ColorZilla
Greasemonkey*
Download Manager Tweak
AI Roboform Toolbar*
MeasureIt

* These are items I can’t live without!