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

DLA 2933-1: firefox-esr security update

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Debian LTS Advisory DLA-2933-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
March 07, 2022   https://wiki.debian.org/LTS
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Package : firefox-esr
Version : 91.6.1esr-1~deb9u1
CVE ID : CVE-2022-26485 CVE-2022-26486

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

For Debian 9 stretch, these problems have been fixed in version
91.6.1esr-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