CentOS Errata and Bugfix Advisory 2015:1025 

Upstream details at : https://rhn.redhat.com/errata/RHBA-2015-1025.html

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

i386:
4345bd1df5b83359f0be4b26593a3c54610ad3f2d8444930c302311210bb88d7  firefox-38.0.1-1.el6.centos.i686.rpm

x86_64:
4345bd1df5b83359f0be4b26593a3c54610ad3f2d8444930c302311210bb88d7  firefox-38.0.1-1.el6.centos.i686.rpm
c5171dd56742ba8dc66c2c37fb3d98e42bd01f78dab535340bab639df881b9cd  firefox-38.0.1-1.el6.centos.x86_64.rpm

Source:
802da2511cfdb9eb1ffbb1e52348b4e7c922707a4dcc8b180cde6827d22501c5  firefox-38.0.1-1.el6.centos.src.rpm