It is noted that Fedora Core 3 ships with Firefox and Thunderbird as well as RealNetworks' Helix Player.
http://www.redhat.com/fedora/
or
http://fedora.redhat.com/
I will see if I can install a copy of Fedora Core 3 in Virtual PC for Mac.
UserAgent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/125.5.5 (KHTML, like Gecko) Safari/125.11

