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

DSA 4749-1: firefox-esr security update

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Debian Security Advisory DSA-4749-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
August 26, 2020   https://www.debian.org/security/faq
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Package : firefox-esr
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 the stable distribution (buster), these problems have been fixed in
version 68.12.0esr-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/