A firefox-esr security update has been released for Debian GNU/Linux 9 LTS to address multiple security issues.

DLA 2880-1: firefox-esr security update

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Debian LTS Advisory DLA-2880-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
January 16, 2022   https://wiki.debian.org/LTS
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Package : firefox-esr
Version : 91.5.0esr-1~deb9u1
CVE ID : CVE-2021-4140 CVE-2022-22737 CVE-2022-22738 CVE-2022-22739
CVE-2022-22740 CVE-2022-22741 CVE-2022-22742 CVE-2022-22743
CVE-2022-22745 CVE-2022-22747 CVE-2022-22748 CVE-2022-22751

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

For Debian 9 stretch, these problems have been fixed in version
91.5.0esr-1~deb9u1.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS