I figured we might as well start a resource for Firefox users, since we have quite a few people that realise Firefix kicks IE ass

So rather than debating Firefox too much this thread is a resource so just links to extensions, themes and related content please. I'm going to start off by listing a few themes and extentions I recommend, themes are quite a personal thing and I found most skins to be rubbish. My preference is for clean designs that are quite minimal so if you like your themes loud I would skip my recommendations
Recommended ThemesTip 1: To install themes that are just links to jar files simply download them to a temporary location and then in Firefox open the Themes manager then just drag/drop the jar file into it.
Tip 2: I personally recommend using the small icons on the toolbar, to do this just right click on the toolbar and select customise. Then when the panel appears check the box labeled 'Use Small Icons'. You'll see the change straight away, click done if you prefer it. Now, on to the themes.
QuteRetro - Basically the 0.8 default theme, tidy simple icons.
Orbit Series - Through Mozilla, Opera and now Firefox Ive always liked the various Orbit skins. Whether you prefer a dull (less distracting) skill or something bold, there is most likely a version to your taste.
More to skins to come.ExtensionsGoogle Bar - This is basically a port of the IE google bar. Personally I think it's way too big and takes over but one thing I do like is in the options - select to use the context sensitive menu addon and then remove the google toolbar. That way you gain some of the features but without the clutter.
Undo Close Tab - This extension allows you to right click on the tabs and bring back tags you closed. I find this invaluable on those occations when you close a tab by accident and grown at the thought of getting back to the page you were on.
Add Bookmark Here - Coming from Opera I missed this feature but using this you can bring it back. This extension gives an extra option on your bookmarks menu (and submenus) that allows you to save your current page to the current sub menu. I find it more convenient than the 'add bookmark' option then finding the folder you want to put it in.
Tabbrowser Preferences - Various useful tab options which I mostly use to make links that would open a new window, open in a tab instead.
Resourcesextensionsmirror.nl - List of Firebox 0.9 compatible extensions
update.mozilla.org - The offical theme site, not many themes yet but a few good ones. Charamel and FireboxModern aint bad. The Orbit series are sorta my old favs as well, well worth checking out.
update.mozilla.org - Quite a few extensions to look through here.
More to come as I found cool things to pass on
mozthemes.tk - A couple of okay themes, Smoke is quite nice though I dont like the rounded ends on the url bar really.
Related Articlesmozilla.org - Firefox 1.0 Roadmap
newarstechnica.com - Lengthy interview Scott Collins from Mozilla.org
newchannels.lockergnome.com - Why You Should Dump Internet Explorer
newneowin.net - 0.9 update tips and discussion
neowin.net - Interview with Ben Goodger from the Mozilla
madpenguin.org - A look at whats new in 0.9, more focused on Linux than Windows
nidelven-it.no - A nice introduce to Firebird for new users (based on 0.7)
mozilla.org - Why you should try Firefox, from the horses mouth.
More to come as I found cool things to pass on