Firefox auto-completing the user's password into inapproprite password unmask form fields (again!)

If the user has set Firefox 83.0 to save and autofill the username and password of the Moodle site, when he/she edits a quiz and clicks in the field to set a password for quitting SEB the browser automatically fills the "Quit password" field with the user's password and the "Show Exit Safe Exam Browser button, configured with this quit link" field with user's username.

It doesn't happen with Google Chrome 87.0.4280.88 or MS Edge 87.0.664.57