Basic Greasemonkey version

[Andrew]

greasemonkey script just increments counter on page load and when modulus is reached it opens a tab

the tab is a localhost static page that does the webcam stuff and uses localstorage for persistent data

must be compatible with qutebrowser's GM implementation

• confirm closing
• dismiss if webcam unavailable/in use
• scheduling
• show warning via "snackbar" e.g. https://www.w3schools.com/howto/howto_js_snackbar.asp
• "disable for X hours" form
  • this seems to work for sending data from page to GM script. for custom events see this
  • can't do: no cross-origin storage