// inject
function ytLoop(from, to) {
  const loop = setInterval(() => {
    const player = document.getElementById("movie_player");
    if (player.getCurrentTime() >= to) {
      player.seekTo(from, true);
    }
  }, 1000);

  document.getElementById("movie_player").seekTo(from, true);
  document.getElementById("movie_player").playVideo();
}

const from = 0;
const to = 0;
ytLoop(from, to);