There is an update to mozilla for CentOS-3.1
https://rhn.redhat.com/errata/RHSA-2004-110.html refers.
updates/i386/RPMS/mozilla-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-chat-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-devel-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-dom-inspector-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-js-debugger-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-mail-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-nspr-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-nspr-devel-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-nss-1.4.2-3.0.2.i386.rpm updates/i386/RPMS/mozilla-nss-devel-1.4.2-3.0.2.i386.rpm updates/i386/SRPMS/mozilla-1.4.2-3.0.2.src.rpm
These are available at http://mirror.centos.org/3.1/ and should be on all mirrors within a few hours.
To update to the latest version 'yum update mozilla' should be sufficient.
Lance