Firebug

Firecookie

FireDiff

FireQuery

FireRainbow

FireUnit

MeasureIt

Netcraft Anti-Phishing Toolbar

Aviary

Download Statusbar

Forecastbar Enhanced

gui:config

Diigo Bookmarks and Web Annotations

Chromifox and Chromifox Companion

All-in-One Sidebar

YSlow

ReloadEvery

NoScript