stopping downloads oin firefox

I am trying to set up some permissions on some work computers for customers to use but I want to make it so they can't even download a gosh darn thing. The admin settings are set but I just can't disable downloading. plox help so I can go home and fap.

>>4
well, if it was a unix like system, you could set up the root password, set up a guest login, and the guest would not have the permissions to delete files owned by root. You can also prevent the guest user from being able to access certain devices, like cdrom , audio, or whatever. If you remove write access to their home directory, they wont be able to save anything anywhere. Alternatively, you could give them a really small quota, like 300 KB.