Mozilla has released security updates to address vulnerabilities in Firefox 75 and Firefox ESR 68.7. It is recommended that you take the necessary precautions by ensuring your products are always updated:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-12/
https://www.mozilla.org/en-US/security/advisories/mfsa2020-13/
The Guyana National CIRT recommends users and administration to review these updates and apply where necessary.
References