A firefox-esr security update has been released for Debian GNU/Linux 10.

DSA 4793-1: firefox-esr security update

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Debian Security Advisory DSA-4793-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
November 18, 2020   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2020-16012 CVE-2020-26951 CVE-2020-26953 CVE-2020-26956
CVE-2020-26958 CVE-2020-26959 CVE-2020-26960 CVE-2020-26961
CVE-2020-26965 CVE-2020-26968

Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code, information disclosure, phishing, cross-site scripting or a DNS
rebinding attack.

For the stable distribution (buster), these problems have been fixed in
version 78.5.0esr-1~deb10u1.

We recommend that you upgrade your firefox-esr packages.

For the detailed security status of firefox-esr please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/firefox-esr

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/