Firefox is vulnerable to cross-site scripting (XSS). An origin confusion error may occur when reloading isolated data:text/html URLs. allowing an attacker to execute malicious scripts.
www.securityfocus.com/bid/97940
www.securitytracker.com/id/1038320
access.redhat.com/errata/RHSA-2017:1106
access.redhat.com/errata/RHSA-2017:1201
access.redhat.com/security/updates/classification/#important
bugzilla.mozilla.org/show_bug.cgi?id=1353975
www.mozilla.org/en-US/security/advisories/mfsa2017-13
www.mozilla.org/security/advisories/mfsa2017-10/
www.mozilla.org/security/advisories/mfsa2017-12/
www.mozilla.org/security/advisories/mfsa2017-13/