firefox -kiosk 'http://your.url'https://support.mozilla.org/en-US/kb/firefox-enterprise-kiosk-mode
https://askubuntu.com/questions/36287/how-to-start-firefox-in-fullscreen-mode
https://www.how2shout.com/linux/how-to-start-firefox-kiosk-mode-ubuntu-20-04-lts/