Turn off/disable YouTube autoplay feature

disable_youtube_autoplay.js

// ==UserScript==
// @name         Disable YouTube Autoplay
// @version      1.0
// @match        *://www.youtube.com/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function () {
  "use strict";

  function disable() {
    let a = document.querySelector(
      "button.ytp-button[data-tooltip-target-id='ytp-autonav-toggle-button']"
    ); // get the button
    if (a.getAttribute("aria-label") == "Autoplay is on") {
      a.click(); // disable autoplay next if enabled
    }
  }

  setTimeout(disable, 3000);
  setTimeout(disable, 9000);
})();