Microsoft has release updates to address a vulnerability in Firefox and Firefox ESR. It is recommended that you take the necessary precautions by ensuring your products are always updated.
For more information on the updates you can follow this url:
Firefox 72.0.1 and Firefox ESR 68.4 .1
The Guyana National CIRT recommends users and administration to review these updates and to apply them where necessary.
Microsoft Release Security updates for Firefox and Firefox ESR (US-Cert)