Firefox Extensions - which are the most useful ?

download status bar
flashgot
video downloader
chatzilla

imageshack right-click.
adblock plus
undoclosetab
fasterfox
linkification
no-script
sessionsaver. :happy:

Greasemonkey!

adblock plus
fasterfox
no-script
Trackmenot
Google toolbar for firefox
ie tab

works fine for me

FasterFox and Grease Monkey are the MUST HAVES!

colourtabs and a good theme improve appearance
fasterfox (although a bit anti-social server side) can dramatically speed up performance
ie tab (displays incompatible pages in ie windows within ff)
foxpose
downthemall
video downloader

noscript