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

DLA 2863-1: firefox-esr security update

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Debian LTS Advisory DLA-2863-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
December 29, 2021   https://wiki.debian.org/LTS
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Package : firefox-esr
Version : 91.4.1esr-1~deb9u1
CVE ID : CVE-2021-38503 CVE-2021-38504 CVE-2021-38506 CVE-2021-38507
CVE-2021-38508 CVE-2021-38509 CVE-2021-43534 CVE-2021-43535
CVE-2021-43536 CVE-2021-43537 CVE-2021-43538 CVE-2021-43539
CVE-2021-43541 CVE-2021-43542 CVE-2021-43543 CVE-2021-43545
CVE-2021-43546

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

Debian follows the extended support releases (ESR) of Firefox. Support
for the 78.x series has ended, so starting with this update we're now
following the 91.x releases.

For Debian 9 stretch, these problems have been fixed in version
91.4.1esr-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