Hi @PiotrD,
I don’t have an answer right now, but I’ve been reviewing and updating the “kiosk” tutorials to ensure they reflect current best practice. I’ll take a look at the issue you raise after the holidays, it may be that there’s a better way to get the access needed by the snap.
In the meantime, @ogra’s suggestion amounts to replacing:
browser-sandbox:
interface: browser-support
allow-sandbox: true
with
browser-support: