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Mozilla has released security updates addressing a
vulnerability affecting Firefox and Firefox ESR. An attacker can take advantage
of this vulnerability to take control of an affected system.
CERT Bulgaria encourages users and administrators to review
the Mozilla security advisory for Firefox
85.0.1 and Firefox ESR 78.7.1 and apply the necessary updates.
https://www.mozilla.org/en-US/security/advisories/mfsa2021-06/