What are some good firefox addons?

[Amerax]

Just switched to Firefox from Chrome, and I'm just looking for some addons that might be useful.

I already have a few like adblock and RES.

[Ad Bot]

[Nal]

fxchrome
BetterPrivacy
DoNotTrackMe
HTTPS Everywhere
Adblock Plus
Stylish
GreaseMonkey
Auto High Definition
FireBug

[carolcat]

colorful tabs

[tails]

Extended Statusbar
Foobar
Ghostery
NoScript
Tab Scope
Youtube Center

[Bisjac]

I want some SMF one that will let me hide topics :D