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Mozilla has released security updates to address
vulnerabilities in Firefox and Firefox ESR. 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
89 and Firefox
ESR 78.11 and apply the necessary updates.
https://www.mozilla.org/en-US/security/advisories/mfsa2021-23/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-24/