Here is a list of Firefox extensions that I cannot live without.

  • Download Status Bar
  • Adblock Plus
  • Flagfox
  • ActiveInbox for Gmail
  • Colorful Tabs
  • LeechBlock

Additionally, here are some more useful ones. I am not sure they are updated often to come up with Firefox 5 now.

  • BBDict
  • CHM Reader
  • Delicious Bookmarks
  • Firebug
  • FireGestures
  • FireShot
  • Google Notebook
  • Greasemonkey
  • IE Tab
  • Speed Dial
  • Tab Mix Plus
  • Web Developer