must have firefox extensions?

so... what do you think are the must have firefox extensions?

i currently use the following:

flashgot - ez mass downloading etc,
Image Zoom - zooms images...duh,
Linkification - converts text links to clickable links cause im a lazy bastard,
googlebar - googlebar,
NoScript - says no to javascript shit,
BugMeNot - one click login for websites,
Fasterfox - optimizes firefox for faster browsing,
adblock plus - removes useless ads,
videodownloader - lets you easily download vids on websites without having to browse the source,
Tab Mix Plus - better tabs + session manager incase firefox crashes,
pearl crescent page saver - saves whole website as image,
platypus - remove useless stuff from websites etc,
greasemonkey - userscript manager which allows customizing of websites and general browser behavior

anything else i NEED?

www.opera.com