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

[SECURITY] [DSA 5421-1] firefox-esr security update

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Debian Security Advisory DSA-5421-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
June 07, 2023 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2023-34414 CVE-2023-34416

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

For the stable distribution (bullseye), these problems have been fixed in
version 102.12.0esr-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/