A firefox-esr security update has been released for both Debian GNU/Linux 9 and 10.

DSA 4695-1: firefox-esr security update

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Debian Security Advisory DSA-4695-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
June 03, 2020 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2020-12399 CVE-2020-12405 CVE-2020-12406 CVE-2020-12410

Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code or a timing attack on cryptographic keys.

For the oldstable distribution (stretch), these problems have been fixed
in version 68.9.0esr-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 68.9.0esr-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/