As per the recent post on the Mozilla Foundation Security Advisories page, dated October 5, 2021, Mozilla has released a new update for Firefox and Thunderbird that includes important new security fixes. The updated include fixes for vulnerabilities that could allow a malicious actor to install programs on your computer, or access and modify your account data.

We advise you update Firefox on all computer and devices, at home and at work, (campus and personal) before you use them to access webpages. Additionally we recommend you not use a web browser while logged in as a user with administrator privileges on your computer.

For information on how to update Firefox see the Mozilla Firefox page, Update Firefox to the latest release.