CentOS Errata and Security Advisory 2006:0328
https://rhn.redhat.com/errata/RHSA-2006-0328.html
The following updated files have been uploaded and are currently syncing to the mirrors:
i386: firefox-1.0.8-1.4.1.centos4.i386.rpm
src: firefox-1.0.8-1.4.1.centos4.src.rpm