Tonight I have assembled a list of 8 Firefox Plug-ins that either make my development life easier or simply add a little flair to my web surfing.  Each plug-in is my own choice and is not a paid endorsement.  These are all free.

IE TAB
Emulates the Internet Explorer rendering engine
Website

InterClue
Preview links before clicking on them
Website

Colorful Tabs
Colors tabs to make each unique
Website

ColorZilla
Advanced eyedropper that allows you to select colors from web pages
Website

Cooliris
3D wall for searching and viewing archives
Website

Download Helper
Allows you to download your favorite media including YouTube videos
Website

FireBug
Web Development Tool
Website

FireShot
Screen shot of the current page. Allows user to add annotations easily.
Website