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Mozilla has released security updates to address
vulnerabilities in Firefox, Firefox ESR, and Thunderbird. An attacker can
exploit some of these vulnerabilities to take control of an affected system.
CERT Bulgaria encourages users and administrators to review
the Mozilla Security Advisories for Firefox
88, Firefox
ESR 78.10, and Thunderbird
78.10, and apply the necessary updates.
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/