Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code or spoofing.
For Debian 10 buster, these problems have been fixed in version 102.9.0esr-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 LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS