[CentOS] Firefox 7 on CentOS 5

Anyone have any luck running updated Firefox
on CentOS 5?  We have CentOS 5 workstations
and need to update their Firefox but it dumps
core even when using the libstdc++ from Fedora 9.

I would like anything stable and secure beyond
Firefox 3 but can't find tarballs for anything
other than 7.0.1.

CentOS 5.5 i386 w/ updates
firefox-7.0.1.tar.bz2
libstdc++-4.3.0-8.i386.rpm from Fedora 9

Thanks,
--
Wade Hampton