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

DSA 5217-1: firefox-esr security update

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Debian Security Advisory DSA-5217-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
August 24, 2022   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2022-38472 CVE-2022-38473 CVE-2022-38478

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

For the stable distribution (bullseye), these problems have been fixed in
version 91.13.0esr-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/