hello,
I started with ftp://download.fedora.redhat.com/pub/fedora/linux/updates/8/SRPMS/firefox-2.0.0.16-1.fc8.src.rpm
with the hope of rebuilding it for el5/centos.
All of the dependencies were available (mostly from rpmforge) except one: something called system-bookmarks. I elected to comment out this from the spec, firefox.spec
I did the extracts with CPIO rpm2cpio firefox-xxx.src.rpm | cpio -i firefox.spec then i extracted everything else and copied it to my buildroot ~/redhat/SOURCES
then the moment of truth. I didn't see another way except to rebuild all so I did
rpmbuild -ba --sign ~/SPECS/firefox.spec
while the above worked, it took long enough that I was able to go to dinner and have a beer before it finished. On top of that, thermal alarms went off as the CPU/PWM reached 57C/67C.
a new RPM, and src.RPM were written to the BR and the RPM (i386) works fine.
Was it necessary to do the complete build (-ba) since I only eliminated a single build-requires value?