Hi. I am asking for help: how to protect with a password (preferably master) any access to the browser (and not only to logins), where there is simultaneous synchronization between several devices. Currently it works like this: I run FF, a popup appears for entering the password. I do not enter the password, I close the popup with "x". And thus I have access to everything that was previously open in the browser (in the previous session). If the user was logged in, I also have access to it. And I would like the use of "x", failure to enter a password, or entering an incorrect one to result in, for example, closing FF. So that there is no access to FF content

Thank you in advance for your help