Firefox Extentions

Considering the recent FF discussion I figure, why not.
I personally like Chrome and Opera better than FF as far as a vanilla browser goes. But I use FF primarily because it has the richest set of plug-ins, which compensates for me. And I'm guessing I'm not the only one with this thought.
So, what extensions do you often use / have installed? I'm curios to know what other good, useful plug-ins, people use (specifically, I imagine as fellow programmers, you want comparatively similar things out of the web).

All extensions I used in Firefox had a Chrome alternative. So the move to Chrome wasn't painful.

Adblock Plus --> Adblock Plus
Gmail Manager --> Mail Checker Plus
FlagFox --> Ultimate Chrome Flag
Firebug --> Firebug Lite & Chrome Developer Tools (built in)
IE View --> IE Tab Multi
Tab Mix Plus --> Not necessary
RoboForm --> RoboForm

Adblock Plus, noscript, lastpass and Status4Evar are the extensions I use. I also have to disable tons of old Java extensions for some reason. The only reason I haven't used Chrome is because I don't like Chrome.