A firefox security update has been released for CentOS 7.

CentOS Errata and Security Advisory 2020:0815 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:0815

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

x86_64:
9ff75bf16b580432dd3c7bcbd00153572de1e59bd5da118d23c8186a4f4341b6 firefox-68.6.0-1.el7.centos.i686.rpm
3aa30cbdf54ea5d1cf3de311cfa89fe7158a645d47d12e4e3decc96403bedf9e firefox-68.6.0-1.el7.centos.x86_64.rpm

Source:
a2eaaa3501eae40743fc36168ac311d4705a93077d43ee2ae0c4da6da24b9223 firefox-68.6.0-1.el7.centos.src.rpm