[ucubed]

Oh if you don't have the beta version of Firefox, it's really nice, it has anonymous browsing like Google Chrome (which is also a very nice browser). I have IE, Chrome, and 2 verisons of Firefox installed in case the beta goes awry. Though it doesn't have some updates on some add-ons.

Fasterfox (in changes of your firefox config files so browsing is a bit faster, though you can do it manually like I did on this beta version of firefox)

FoxyProxy (let's you add proxies and switch between them)
Greasemonkey - helps with scripts
IE tabs - lets you open IE tabs in Firefox
Download helper - easier to download things like youtube videos or hidden things you can't find download button for
adblock plus -
ctrl-tab - just a cool thing for tab browsing
clipmarks - similar to MACS ability to save paragraphs as an image or whatever
download status bar - the download bar is too big, this makes it smaller
firebug - for bugs
noscript
tab mix plus - also a tab browsing thing