CentOS Errata and Bugfix Advisory 2016:1009 

Upstream details at : https://rhn.redhat.com/errata/RHBA-2016-1009.html

The following updated files have been uploaded and are currently 
syncing to the mirrors: ( sha256sum Filename ) 

i386:
8a1b5a12cc396b85b2bb8022acc81358366d4a24b6d819ad887478f4b3aad972  firefox-45.1.1-1.el5.centos.i386.rpm

x86_64:
8a1b5a12cc396b85b2bb8022acc81358366d4a24b6d819ad887478f4b3aad972  firefox-45.1.1-1.el5.centos.i386.rpm
7cc5b5f1ba36683f7f8b2c04ffaf7151aec3212356d708a852c531b42b6dcf3a  firefox-45.1.1-1.el5.centos.x86_64.rpm

Source:
2d374e8d6925993a0c43346ab99b73ab7265e334326237318249adacbdade2c4  firefox-45.1.1-1.el5.centos.src.rpm