Mozilla released Firefox 100.0.2 on May 20, 2022. A small update that fixes two vulnerabilities, all of which are of critical difficulty. You can find the details of the vulnerabilities here see. Thunderbird users can also search for an update right away, because the vulnerabilities also affect the mail program. You are on the safe side if you are using the update to version 91.9.1 of Thunderbird. In this sense: Just import the small update and be safer on the road.