From 2019 to now, Mozilla not do anything about to alert to the user about MITM certificates. If the user don't click in the certificate to view the info, the user never knows if they have a MITM certificate, for example.
This a common behavior in antivirus, etc.
If the browser not alert to the user, the user probably never knows about the MITM.
https://blog.mozilla.org/security/2019/08/21/protecting-our-users-in-kazakhstan/
From 2019 to now, Mozilla not do anything about to alert to the user about MITM certificates. If the user don't click in the certificate to view the info, the user never knows if they have a MITM certificate, for example. This a common behavior in antivirus, etc. If the browser not alert to the user, the user probably never knows about the MITM.