I must admit, if you expand Firefox with several Addons, it becomes
a very handy and sleek browser. While FF4 had to deal with speed
issues and often stalled with unknown errors or finally stopped
working, Firefox 6 seems to run much more stable than the old version.

I did not use FF5 as I was not aware of it’s release. So I just skipped that major version ;)

These are, in my opinion, good and helpful addons:

• ABP – AdBlock Plus
• Linkification (Nut doesn’t run in FF6 yet)
• Awesome Screenshot
• Spell Checker
• gTranslate
• Greasemonkey
• iMacros
• lori
• UserAgent Switcher (rarely used but some sites can be picky!)
• DownloadHelper (real good yt downloader)
• WOT (Can be good if you use a computer at work)

So what are your favourite tools for Firefox? Feel free to comment here. But avoid hinting to Chrome, Safari or Opera! I know these browsers and use them (on my private machines!)