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

DSA 5113-1: firefox-esr security update

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Debian Security Advisory DSA-5113-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 06, 2022   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2022-1097 CVE-2022-1196 CVE-2022-24713 CVE-2022-28281
CVE-2022-28282 CVE-2022-28285 CVE-2022-28286 CVE-2022-28289

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

For the oldstable distribution (buster), these problems have been fixed
in version 91.8.0esr-1~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 91.8.0esr-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/