A firefox-esr security update has been released for both Debian GNU/Linux 9 and 10 to address multiple security issues in the Mozilla Firefox web browser.

DSA 4713-1: firefox-esr security update

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Debian Security Advisory DSA-4713-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
July 01, 2020   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2020-12417 CVE-2020-12418 CVE-2020-12419 CVE-2020-12420
CVE-2020-12421

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

For the oldstable distribution (stretch), these problems have been fixed
in version 68.10.0esr-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 68.10.0esr-1~deb10u1.

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/