Ok, so I run firefox and wanted to know what extensions other people have installed. I'm pretty sure I have all the ones I need or could ever use, but who knows?
Here's what I use:
Theme:
Noia Extereme -- A complete UI makeover, very nice grapics, and some added functionality.
Extensions:
Nuke Anything -- Allows you to temporarily remove any object or text from a page. Helpful when printing webpages.
Adblock -- Amazing ad/image blocker. You can use wildcards and regexp to block all images from certain domains!
Tweak Network Settings -- Modifies some net parameters so your pages load faster
