Snippet for Chrome - When you are using Google Chrome for playing video or audio, but Right and Left arrow buttons don't work properly.

player.extension.js

;((d, s) => {
  const player = s
    ? d.querySelector(s)
    : d.querySelectorAll('audio')[0]
    || d.querySelectorAll('video')[0];

  d.addEventListener('keydown', ({ key }) => key === 'ArrowRight'
    ? player.currentTime += 5
    : key === 'ArrowLeft' && (player.currentTime -= 5)
  );
})(document/*, selector <- custom selector*/);