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

DSA 5259-1: firefox-esr security update

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Debian Security Advisory DSA-5259-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
October 19, 2022   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2022-42927 CVE-2022-42928 CVE-2022-42929 CVE-2022-42932

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 (bullseye), these problems have been fixed in
version 102.4.0esr-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/