Clear Watched (for when you get 502 errors trying to remove watched videos from your YouTube watched later)

clear-watched.js

window.setInterval(
async() => {
let f = document.querySelector('.ytd-playlist-video-renderer .ytd-thumbnail-overlay-resume-playback-renderer');
if (f) {
  f = f.parentElement.parentElement.parentElement.parentElement.parentElement.parentElement.parentElement.querySelector('#menu yt-icon-button');
}
if (!f) {
  f = document.querySelector('.ytd-playlist-video-renderer img[src="https://i.ytimg.com/img/no_thumbnail.jpg"]');
  if (f) {
    f = f.parentElement.parentElement.parentElement.parentElement.parentElement.parentElement.querySelector('#menu yt-icon-button');
  }
}
if (f) {
  f.scrollIntoView();
  f.click();
} else {
  const allItems = document.querySelectorAll('.ytd-playlist-video-renderer');
  allItems[allItems.length-1].scrollIntoView();
}
await new Promise(resolve => window.setTimeout(resolve, 50));
document.querySelector('ytd-menu-service-item-renderer:nth-child(3)').click();
}, 1000);