You're kidding, right?
There are some I can't stand to be without:
- All-in-One Sidebar
- BBCodeXtra
- CookieCuller
- Fasterfox
- Yahoo! Mail Notifier
- Paste and Go 2
- Yes popups
For security, I use:
- Adblock Plus
- Adblock Filterset.G Updater
- Flashblock
- McAfee SireAdvisor
- NoScript
Others that I use in various functions:
- Aging Tabs
- ColorfulTabs
- Download Manager
- Downlaod Statusbar
- FEBE (Firefox Extension Backup Extension)
- Firebug
- FirefoxMenuButtons
- Fitt's Back Button
- Gmail Notifier
- IE Tab
- Nightly Tester Tools
- Personas for Firefox
- Smiley Xtra
- Splash
- Tabbrowser Preferences
- Tiny Menu
- TinyURL Creator
- Toolbar Buttons
- translator
- United States English Dictionary (for the inline spell checker)