https://us-cert.cisa.gov/ncas/current-activity/2020/07/29/mozilla-releases-security-updates-multiple-products

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 following Mozilla Security Advisories and apply the necessary updates: