General discussion

Have you checked out Safecahe\Safehistory? Im not really sure how to check if it works etc - gonna look into it more in the future..

Here are my additions to the good add-ons list:
Flashblock
Mouse Gestures (very handy)

Some are still not working since the FF3 release... To all that have suggested other extensions.. Big thumbs up they integrated perfectly into my setup..

Peace
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Jared Gray

There's a extension for Firefox called "ProCon" used for lock all kind of unwished content on the Web. Check it out.

You are missing Noscript, that is a must have to surf the web in the most safe way. With Noscript well configured, anyone can surf almost any place, even some very dangerous ones.

Another good one for FireFox is key scrambler but it doesn't seem to be available for FF3 yet. If anyone knows how to install it, let me know

If I should recommend only one addon to FireFox, it would be NoScript

I agree, I useAd-block-plus, NoScript and of course WOT but I can also recommend Flagfox, it jumps in and tells you that even though this is .co.uk it is actually in Canada or wherever and other interesting stuff like whois etc. and also the Alexa Sparky to find out whats linking in, you can find out all sorts of things. and no I’m not really paranoid just careful. enjoy.

Ad block plus
All in one sidebar
Awesome search
Better gmail 2
Bug me not
Ctrl tab
Customize google
Download statusbar
Fasterfox
Firebug
Firefox showcase
Firegestures
Flagfox
Forecastfox
Foxyproxy
Google preview
Greasemonkey* (See more: http://www.pcworld.com/article/147266/17_greasemonkey_scripts_to_turboch...)
Link alert
Locationbar²
Mimimap addon
No script
Panic
Bush countdown
Tab scope
User agent switcher
Web developer
WOT

RayQuang

To lacy to type them - here is a screenshot.
http://bildr.no/view/264948

JTB

i've been trying to be careful with my enthusiasm after my brother-in-law, who is a developer, warned me that some of the extensions are pretty hackable (but he didn't mean any of the major, recomended ones), but i have never really had any problem about safety of extensions. The only thing is they can cause bugs sometimes, but that's just the nature of softwares itself :-P
I CANNOT LIVE WITHOUT:
#1: image toolbar (there are several add-ons with this name, this one specificaly is by Ben Basson from cusser.net, and reproduces a feature that has previously been in the core of old IE, ultimately ditched, which consisted of a little toolbar that appeared on the top corner of a picture on mouse-over, allowing you to directly save the image to a predetermined folder without the prompt window. this is like a HUGE time-saver, probably the greatest time saver ever. I don't understand why IE ditched it.
#2: adblock plus / adblock filterset.G
#3: noscript
#4 WOT
(no comments needed on the 3 above) ;-)
#5: DownThem All!: allows batch download filtered by extensions. I like it better than flashgot, download helper or any other firefoz dl. manager.
#6 Customize Google

I can live without them, but they would be very missed, and their absence would make my job much harder:
#1 Flagfox: adds either to the searchbar or taskbar a flag, indicating the country where the is the server that hosts the site. when you mouse-over the flag, it shows the the site's IP number and allows you to research on whois or related sites. Since it promptly shows the IP it's a very handy tool in case you use proxywebs and proxy sites for any purpose.
#2 FoxyTunes
# 3 ScribeFire
#4 Text Formatting Toolbar, by Michael Buckley
#5 Show my IP by Michael Klaus: keeps your own IP number visible in the taskbar.
#6 Piclens and CoolIris Previews
#7 Chatzilla
#8 Secure Password Generator by Jeremy Gillick: because you should never use the same password for every site! And make sure you go old school and write it down in paper afterwards. And then put the paper locked in a safe. Paranoid enough for ya?? :-P hehe
#9 Foxy Proxy