[MiddleEndian]

Unfortunately, if you bring your cursor to the top of the screen there's a message (in Firefox) and an X (in Chrome) that inform the user that they are in a full screen webpage.

[forgotpwd16]

Run, if Chromium (or Chrome)

    chromium --kiosk <url>

or, similarly for Firefox

    firefox --new-window --kiosk <url>

For Chromium the `--new-window` argument doesn't open in kiosk mode. In order to work no other instance must run.

[MiddleEndian]

I am definitely using this on my friend's living room computer. "Linux was acting weird so I installed Windows"

[xwx]

This happens if you press F11. If you click the balloon that says "Start the prank" instead then you won't get this issue, at least in Firefox.

[pragmatick]

Cannot confirm - it just takes a while to show. You can still press Esc which is what most users might do when panicking.