The following FASTBUGS have been uploaded to:
http://ftp.scientificlinux.org/linux/scientific/7x/x86_64/updates/fastbugs/
x86_64:
7x/x86_64/firefox-91.2.0-5.el7_9.i686.rpm
7x/x86_64/firefox-91.2.0-5.el7_9.x86_64.rpm