Web Programmer, "SecurityError: Access denied" on Linux (SOLVED)

Hey, Can’t connect with the web programmer, even though “DFU…” appears as a connection and I (try to) enable it. I get “SecurityError: Access denied”. I’m on Chrome 65 on Debian. Any ideas? *edit: It seems I may need to add a udev rule for the device, for Chrome to have access to it, looking in…