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. Security vulnerabilities fixed in Firefox 90, Firefox ESR 78.12 and Thunderbird 78.12.

More information on vulnerabilities and updates is available in Mozilla security advisories:

• Firefox 90
• Firefox ESR 78.12
• Thunderbird 78.12