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

DLA 2346-1: firefox-esr security update

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Debian LTS Advisory DLA-2346-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
August 27, 2020   https://wiki.debian.org/LTS
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Package : firefox-esr
Version : 68.12.0esr-1~deb9u1
CVE ID : CVE-2020-15664 CVE-2020-15669

Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code or unintended or malicious extensions being installed.

For Debian 9 stretch, these problems have been fixed in version
68.12.0esr-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