Browsers only allow sound after one click. After this you can walk away - every video in the list plays by itself, with a countdown in between. Press F for real fullscreen.

The next video starts automatically - click anywhere to skip the wait

If you added new links and saved the file, they play next - otherwise the whole list starts again. Click to go now.

Add more links to the list in playlists.js and save it. This page re-checks by itself every 60 seconds and carries on where it stopped.