Thanks Jim...updating just now:)
Jim Perrin <jperrin@gmail.com> escribió:
> Before was in centosplus repository
>
> http://mirror.centos.org/centos/4.3/centosplus/i386/RPMS/
>
> But now 1.5.0.2 is last release, I know that never versions have security
> updates, but don't know if Linux versions of firefox was affected or not.
The upstream vendor pushed firefox 1.5.x into the base distro, so it's
no longer a centosplus package. If you excluded firefox from the base
or updates repository, you need to undo that.