A firefox-esr security update has been released for Debian GNU/Linux 10 to address multiple security issues, which could potentially result in the execution of arbitrary code or information disclosure.

DSA 4840-1: firefox-esr security update

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Debian Security Advisory DSA-4840-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
January 27, 2021   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2020-26976 CVE-2021-23953 CVE-2021-23954
CVE-2021-23960 CVE-2021-23964

Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code or information disclosure.

For the stable distribution (buster), these problems have been fixed in
version 78.7.0esr-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/