The following errata for CentOS-2 have been built and uploaded the the centos mirror:
RHSA-2004:486-01 Updated mozilla packages fix security issues
This package has been modified to fix bug #120019 and remove the redhat bookmarks.
Files available: mozilla-1.4.3-2.1.4.c2.1.i386.rpm mozilla-chat-1.4.3-2.1.4.c2.1.i386.rpm mozilla-devel-1.4.3-2.1.4.c2.1.i386.rpm mozilla-dom-inspector-1.4.3-2.1.4.c2.1.i386.rpm mozilla-js-debugger-1.4.3-2.1.4.c2.1.i386.rpm mozilla-mail-1.4.3-2.1.4.c2.1.i386.rpm mozilla-nspr-1.4.3-2.1.4.c2.1.i386.rpm mozilla-nspr-devel-1.4.3-2.1.4.c2.1.i386.rpm mozilla-nss-1.4.3-2.1.4.c2.1.i386.rpm mozilla-nss-devel-1.4.3-2.1.4.c2.1.i386.rpm
More details are available from the RedHat web site at https://rhn.redhat.com/errata/rh21as-errata.html
The easy way to make sure you are up to date with all the latest patches is to run: # yum update