I see that with Firefox 2.0 only recently released, Mozilla already has an advance version of Firefox 3.0 out - it's called "Gran Paradiso Alpha 1", presumably a reference to the Italian national park of the same name :-) But who can tell where they get these names from? The pilot of version 2.0 was "Bon Echo" - which is a provincial park in Ontario. Perhaps the development team has a thing about parks?
I have some grouses with Firefox 2.0 - the location of its new tab button is not as convenient as the one in Maxthon (where it appears at the end of the existing tabs - very convenient), and its pdf download can still be messy. In fact its downloads are a disaster - everything I simply want to view has to be downloaded and saved somewhere - VERY messy.
If you are really, really into browser development, there's also a Firefox 3 wiki.
I'm really torn, but currently I'm using Maxthon more than I'm using Firefox.