disable-youtube-autoplay/disable-youtube-autoplay.user.js

// ==UserScript==
// @name         Turn off Youtube Autoplay
// @namespace    https://bubbletea.dev/
// @version      1.0
// @description  Disables Youtube recommended videos from automatically playing
// @author       shibao
// @include      https://www.youtube.com/watch*
// @downloadURL	 https://gitea.bubbletea.dev/bubbletea.dev/disable-youtube-autoplay/raw/branch/master/disable-youtube-autoplay.user.js
// @updateURL	 https://gitea.bubbletea.dev/bubbletea.dev/disable-youtube-autoplay/raw/branch/master/disable-youtube-autoplay.user.js
// @grant        none
// ==/UserScript==

function disableAutoplay() {
  var e = document.querySelector('button.ytp-button[data-tooltip-target-id="ytp-autonav-toggle-button"]');
  if (e == null) {
    console.error('Youtube checkbox could not be found!');
  } else {
    var isChecked = document.querySelector('.ytp-autonav-toggle-button').getAttribute('aria-checked') == "true";
    if (isChecked) e.click();
  }
}

(function () {
  'use strict';
  document.onLoad = setTimeout(disableAutoplay, 1000);
}) ();