Items not on you list:[in no particular order]
User Agent Switcher - Allows you to fake signatures of browsers, and allows you to fake the installation of megadownload tool bar(which has way too much spyware)
Tabbrowser Preferences - more tab preferences and control
SwitchProxy Tool - Very handy for switching between Saix transparent proxies when downloading from Rapidshare.
Stealther - When enabled does not allow cookies, cache etc to be stored.
Session Manager- Allows you to restore firefox to which ever state it was even during power failures
Also allow e.g. you to pre set windows in a particular way with tabs that can be loaded. e.g. support sites, all teh forums loaded in one click as you left it.
Server Spy - Check out what Webserver the site is using.
PDF download - lets you choose if you want to download/view/save and open in acrobat etc handy
PageStyle2Tab - sets the tab to the same html/background style as page so your tabs look different for websites.
ImageZoom - right click on any image and scroll and the picture gets bigger
GoogleNotebook- Take/Make notes for later review on any page, you can also grab bits of the website you capturing including pictures
with they'd integrate it with blogger.
Google Web comments - make comments and blog to blogger.. broken with new blogger accounts
FlashGot - forces downloads and can autocollect downloads/links to download manager of your choice which it auto detects
Cutemenus Crystal SVG - makes firefox look kick a$$ with nicer icons in your pull down menus.
Customise Google - duh no more ads
CacheViewer - So you watched a youtube movie or flv file or list to music.. but want it, this lets you get it from cache and save it
Adblock filterset.G Updater - updated lists of new advert sites to block
