Original release date: December 16, 2020Mozilla has released security updates to address vulnerabilities in Firefox, Firefox ESR, and Thunderbird. An attacker could exploit some of these vulnerabilities to take control of an affected system.  

CISA encourages users and administrators to review the Mozilla Security Advisories for Firefox 84, Firefox ESR 78.6, and Thunderbird 78.6 and apply the necessary updates.  

This product is provided subject to this Notification and this Privacy & Use policy.Original release date: December 16, 2020

Mozilla has released security updates to address vulnerabilities in Firefox, Firefox ESR, and Thunderbird. An attacker could exploit some of these vulnerabilities to take control of an affected system.  

CISA encourages users and administrators to review the Mozilla Security Advisories for Firefox 84, Firefox ESR 78.6, and Thunderbird 78.6 and apply the necessary updates.