I’ve been using the Firefox 3 beta for about a week now and I’m really happy with it so far. It’s a lot faster and less of a memory hog in OSX than its predecessor. The one thing I was wishing for was the beautiful, extremely useful, firebug extension… I kept opening Firefox 2 whenever I needed to do UI work.

Then I realized I hadn’t even checked if Firebug was compatible with Firefox 3, aside from the initial plugin compatibility check that Firefox does on its first run.

Lo and behold: the latest firebug beta works with Firefox 3 beta release 4! YES!

so what are you waiting for? install it now:
firebug beta xpi