I see firefox-45.5.1 in 7rolling/testing http://ftp.scientificlinux.org/linux/scientific/7rolling/testing/x86_64/7.3-security/firefox-45.5.1-1.el7_3.x86_64.rpm but nothing for SL6 nor anything in the security updates. Is there a problem rebuilding this critical update ? https://rhn.redhat.com/errata/RHSA-2016-2843.html The same bug is also in Thunderbird: https://rhn.redhat.com/errata/RHSA-2016-2850.html Thanks, -- Andrew C Aitchison