Firefox Addons?

Just started using Firefox again (don't know why I ever stopped), and I need some suggestions for add-ons to use..

If you have any that you think are cool or fun, let me know..
The only ones I have are 'Tamper Data' and 'Easy Youtube Downloader'.
Don't suggest Firebug though, already got that on my list to download.

Thanks.

I recommend getting the Remove Cookies Add-on and the Reload Every Add-on and also the Adblock Pro Add-on. That's the only 3 add-ons I use for Firefox.

Browsers Plugins :
This are a few plugins that will make your live more easy and comfortable:

• Add AdBlock Plus
• Add LastPass
• Add Ghostery
• Add HTTPS Everywhere
• Add No Script
• Add WOT