CentOS Errata and Security Advisory 2009:0449 Critical https://rhn.redhat.com/errata/RHSA-2009-0449.html
The following updated files have been uploaded and are currently syncing to the mirrors:
x86_64: firefox-3.0.10-1.el4.centos.x86_64.rpm
src: firefox-3.0.10-1.el4.centos.src.rpm