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

DSA 5400-1: firefox-esr security update

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Debian Security Advisory DSA-5400-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 10, 2023   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2023-32205 CVE-2023-32206 CVE-2023-32207 CVE-2023-32211
CVE-2023-32212 CVE-2023-32213 CVE-2023-32215

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

For the stable distribution (bullseye), these problems have been fixed in
version 102.11.0esr-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/