Best add-ons?

[Notieboie]

I got the idea to make a thread where you could post your favorite add-ons for firefox or other browsers. Here are my favorite firefox add-ons:

Phzilla : https://addons.mozilla.org/en-US/firefox/addon/3239
FastestFox : https://addons.mozilla.org/en-US/firefox/addon/9825
Flagfox : https://addons.mozilla.org/en-US/firefox/addon/5791
BetterPrivacy : https://addons.mozilla.org/en-US/firefox/addon/6623
Adblock Plus : https://addons.mozilla.org/en-US/firefox/addon/1865
Greasemonkey : https://addons.mozilla.org/en-US/firefox/addon/748
NoScript : https://addons.mozilla.org/en-US/firefox/addon/722

Post your favorites so everyone can see!

Nice addons , used them all except flagfox