20 Best Firefox Extensions

  1. ScrapBook
    Capture web page and better than IE mht format
    http://amb.vis.ne.jp/mozilla/scrapbook/
  2. Stylish
    Style your Firefox or website using CSS.
    http://www.userstyles.org/stylish/
  3. Password Maker
    Creating unique password for each site based on domain and more.
    http://www.passwordmaker.org/
  4. Adblock Plus
    Block almost evey ad banners.
    http://www.adblockplus.org/
  5. Download Statusbar
    Small status bar to monitor file download.
    http://downloadstatusbar.mozdev.org/
  6. FEBE Backup
    Backup Firefox profile, extensions, and more
    http://www.customsoftwareconsult.com/extensions
  7. IE Tab
    Tab in Firefox using IE engine
    http://ietab.mozdev.org/
  8. Tab Mix Plus
    Tab Management Extension
    http://tmp.garyr.net/
  9. View Source With
    Controlling how to view web source
    http://dafizilla.sourceforge.net/viewsourcewith
  10. Linkification
    Create a link from hyperlink text
    http://www.yellow5.us/firefox/linkification/
  11. Key Config
    Remapping Firefox Keyboard Shortcuts
    http://mozilla.dorando.at/
  12. Web Developer
    Web Developing Gadget
    http://www.chrispederick.com/work/web-developer/
  13. Firebug
    Web Developing Gadget
    http://www.getfirebug.com/
  14. CHM Reader
    Reading CHM file in Firefox
    http://www.getfirebug.com/
  15. Compact Menu 2
    Small Button Compact Menu to replace standard MenuBar
    https://addons.mozilla.org/firefox/108029/author/
  16. CuteMenus - Crystal SVG
    Give Icon to almost all Firefox Menu or Context Menu
    http://www.cutemenuproject.com/
  17. Fission
    Move download progress into address bar + customize progress color
    http://forums.mozillazine.org/viewtopic.php?t=370248
  18. Menu Editor
    Edit Firefox menu arrangement
    http://menueditor.mozdev.org/
  19. Organize Statusbar
    Organize items in Statusbar
    http://www.yellow5.us/firefox/osb/
  20. Add Bookmark Here 2
    Right Click Add Bookmark Here in the Bookmark Menu
    https://addons.mozilla.org/firefox/3880/

Also a very good extension but I'm lazy to change the title to more than 20 :)

  1. Add to Search Bar
    Add you search engine to search bar
    http://www.maltekraus.de/Firefox/search-tools
  2. Restart Firefox
    http://extensions.jedbrown.net/
  3. Bookmark Duplicate Detector
    http://bookmarkdd.mozdev.org/
  4. Edit Config Files
    Editing Firefox config, chrome, etc
    http://s2works.homeunix.net/download/extensions.shtml#editconfigfiles
  5. iMacros
    Run macro on Websitess
    http://www.iopus.com/imacros/firefox
  6. ColorZilla
    Colorpicker for Firefox
    http://www.iosart.com/firefox/colorzilla/
  7. Firefox Showcase
    Showcase for Firefox tabs
    http://showcase.uworks.net/
  8. Disable XPI Install Delay
    http://www.mrtech.com/extensions/
  9. Greasemonkey
    Using JavaScript to customize Firefox
    http://greasemonkey.mozdev.org/
  10. BBCodeXtra
    vBulletin & phpBB Helper Extension
    http://bbcodextra.extenzilla.org/

Wow...actually I cannot stop just at 20 since these are Firefox 2 that I use and a couple more but I'm tired typing.