There is a windows version of phoenix/firebird. You can find it here
http://ftp.mozilla.org/pub/phoenix/r...-0.5-win32.zip
Take notice though, that its an old version. There are a lot of new features in the cvs version, but they don't have everything they want to make the .6 version yet. I'm not sure if you can get the cvs version in windows.
Its pretty quick. I use mozilla primarily though because I like the mail client.
Its a good relationship between Netscape and Mozilla, Netscape helps them out with development, Mozilla gives them new and better stuff.
If you have any problems with it or want to get more of an inside view of the whats going on with mozilla/related projects,, I'd suggest checking out the forums at
www.mozillazine.org. I've learned a lot of things I didn't know from those forums
www.mozdev.org is a good place to find add-ons for mozilla, such as themes, mouse gestures, lots of other neat stuff.