Are those products included in Fedora Core 1 distribution?
No, not as far as I know.
If no where can I get xft enabled rpms for them?
Mozilla distributes tarballs, just extract them in /usr/local, or somewhere in your home dir (either will work fine, I use ~/root/bin/).
http://ftp.mozilla.org/pub/mozilla.org/firebird/releases/0.7/ http://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/0.3/
