What is the best way to restrict access to the browser?

Question

Browsers

Tell me a way to password-protect Windows transcriptions, in my case it is required to prohibit unauthorized persons from accessing the FireFox browser, the way to password-protect a Windows profile is not suitable, since every student can break this password. In addition, I log in through a domain account :)
The extension / add-on option for the FireFox browser is also not suitable, since add-ons do not work in safe mode. The master password does not allow you to enter only the password store, otherwise it is useless. I tried to install applications like WinLock, but something didn’t work out to configure them correctly, besides, the question of how easy it is to bypass this protection remains open.
The only two more or less safe and working options are either Kaspersky's parental control, but it's not very convenient to turn it on / off every time, besides, you can easily forget to turn it on when you leave the computer for a long time. And the second option is to use the portable version and carry it with you on flash drives, here you yourself understand the mass of minuses.

Answer 1

Paranoia is not curable. With physical access to a PC, there is little help other than encrypting the entire drive.
P.S. Can you crack the Windows login password yourself?

Answer 2

Maybe dig in the direction of the work schedule of the proxy server / router?
"My mom says the internet is a bad and dangerous place. That's why I only have one about:blank page. It was boring at first, but then I got hooked. Now I have 2 virtual friends living there and I can hear voices from the outlet!"