A firefox security update security update has been released for CentOS 7.

CentOS Errata and Security Advisory 2020:0520 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:0520

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

x86_64:
cabd0f607b8b426403c5f833334f15cb36b727b8792d122f3bb2547d4d965618 firefox-68.5.0-2.el7.centos.i686.rpm
11046ce36b466eeb0619c65b9df1ed10137bb07f3f01eba9a97d05648a04d714 firefox-68.5.0-2.el7.centos.x86_64.rpm

Source:
377fa5d423b415ca61552036614942832b1570258973ad8541056292981425b4 firefox-68.5.0-2.el7.centos.src.rpm