I just installed Firefox 2.0 the day it came out, and for some reason, I can't press Alt+I, Alt+B, etc. to get the code inserted into the post. I have to manually click on the tag button above the post. Hope you can fix that to save us Firefox 2.0 users some time!
Ah, so it works now. Here's what you do:
Up in the address bar, type "about:config" (without the quotes of course). Scroll down to "ui.key.contentAccess" and change the value to 4.