Mozilla published security updates on 23rd February 2021, addressing vulnerabilities in the following products. It is recommended that you take the necessary precautions by ensuring your products are always updated.
Firefox
Firefox ESR
Thunderbird
For more information on these Mozilla update, you can follow the URL:
https://www.mozilla.org/en-US/security/advisories/
The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary.
PDF Download: Mozilla Security Advisory.pdf
References
Mozilla Foundation Security Advisories (23rd, February 2021). Retrieved from Mozilla.
https://www.mozilla.org/en-US/security/advisories/
Mozilla Security Advisory (23rd, February 2021). Retrieve from the Canadian Centre for Cyber Security (Cyber Centre)