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Original release date: May 4, 2022 | Last revised: May 5, 2022

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 Advisory for Firefox 100, Firefox ESR 91.9, and Thunderbird 91.9 and apply the necessary updates. 

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