firefox is vulnerable to denial of service (DoS). The vulnerability exists through memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5.
access.redhat.com/errata/RHSA-2020:0519
access.redhat.com/security/updates/classification/#important
bugzilla.mozilla.org/buglist.cgi?bug_id=1595786%2C1596706%2C1598543%2C1604851%2C1608580%2C1608785%2C1605777
security.gentoo.org/glsa/202003-02
security.gentoo.org/glsa/202003-10
usn.ubuntu.com/4278-2/
usn.ubuntu.com/4328-1/
usn.ubuntu.com/4335-1/
www.mozilla.org/security/advisories/mfsa2020-05/
www.mozilla.org/security/advisories/mfsa2020-06/
www.mozilla.org/security/advisories/mfsa2020-07/