Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code, information disclosure or spoofing.
For the oldstable distribution (buster), these problems have been fixed in version 91.6.0esr-1~deb10u1.
For the stable distribution (bullseye), these problems have been fixed in version 91.6.0esr-1~deb11u1.
We recommend that you upgrade your firefox-esr packages.
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/