A firefox-esr security update has been released for Debian GNU/Linux 10 and 11 to address two security issues.

DSA 5090-1: firefox-esr security update

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Debian Security Advisory DSA-5090-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 06, 2022   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2022-26485 CVE-2022-26486

Two security issues have been found in the Mozilla Firefox web browser,
which result in the execution of arbitrary code.

For the oldstable distribution (buster), these problems have been fixed
in version 91.6.1esr-1~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 91.6.1esr-1~deb11u1.

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/