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Mozilla has released security updates to
address vulnerabilities in Firefox and Thunderbird. An attacker could
exploit some of these vulnerabilities to take control of an affected system.
CERT Bulgaria encourages users and administrators to review
the Mozilla Security
Advisory for Firefox 91.0.1 and Thunderbird 91.0.1 and apply the
necessary updates.
https://www.mozilla.org/en-US/security/advisories/mfsa2021-37/