A firefox-esr security update has been released for Debian GNU/Linux 9 and 10 to address multiple security issues.

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Debian Security Advisory DSA-4639-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 11, 2020   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2019-20503 CVE-2020-6805 CVE-2020-6806 CVE-2020-6807
CVE-2020-6811 CVE-2020-6812 CVE-2020-6814

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 68.6.0esr-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 68.6.0esr-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/