Disable YouTube autoplaying everywhere.

youtube-disable-autoplaying.user.js

// ==UserScript==
// @name         YouTube Disable Autoplaying
// @version      1.0.2
// @description  Disable YouTube autoplaying everywhere.
// @author       Lumynous
// @license      MIT
// @match        https://www.youtube.com/*
// @noframes
// @downloadURL  https://gist.github.com/lumynou5/b036f405a0888bf9c3b9a3f560e36f3d/raw/youtube-disable-autoplaying.user.js
// @updateURL    https://gist.github.com/lumynou5/b036f405a0888bf9c3b9a3f560e36f3d/raw/~meta
// ==/UserScript==

'use strict';

const querySelectorAsync = (function () {
  const callbacks = new Set();
  const observer = new MutationObserver((mutations) => {
    for (const mutation of mutations) {
      for (const node of mutation.addedNodes) {
        if (node.nodeType !== Node.ELEMENT_NODE)
          continue;
        for (const {selector, callback, self} of callbacks) {
          if (!node.matches(selector))
            continue;
          callback(node);
          callbacks.delete(self);
        }
        if (!callbacks.size) {
          observer.disconnect();
          return;
        }
      }
    }
  });

  return function (selector) {
    return new Promise((resolve) => {
      const elm = document.querySelector(selector)
      if (elm) {
        resolve(elm);
        return;
      }
      if (!callbacks.size)
        observer.observe(document, {childList: true, subtree: true});
      callbacks.add({
        selector,
        callback: resolve,
        get self() { return this; },
      });
    });
  };
})();

const button = document.createElement('button');
button.classList.add('ytp-button');
button.style.width = '40px';
button.style.height = '100%';
const container = document.createElement('div');
container.classList.add('ytp-autonav-toggle-button-container');
const inner = document.createElement('div');
inner.classList.add('ytp-autonav-toggle-button');
inner.style.margin = '0 auto';
button.appendChild(container).appendChild(inner);

const manager = document.querySelector('yt-playlist-manager');
let state = false;
function setState(newState) {
  state = newState;
  manager.set('canAutoAdvance_', state);
  inner.setAttribute('aria-checked', state.toString());
};
button.addEventListener('click', () => setState(!state));

document.addEventListener('yt-page-data-updated', (ev) => {
  // For miniplayer, the URL doesn't reflect it's a playlist.
  setState(state);
  if (ev.detail.pageType !== 'watch' || !location.search.match(/\?(?:.*&)?list=.*/))
    return;
  document.querySelector('#playlist-actions #end-actions #flexible-item-buttons').replaceChildren(button);
});

// Prevent home page videos from autoplaying.
const preview = await querySelectorAsync('ytd-video-preview');
preview.remove();

// The shorts player is lazily created until watching a shorts.
const shorts = await querySelectorAsync('#shorts-player video');
const shortsObserver = new MutationObserver((mutations) => {
  for (const mutation of mutations) {
    if (mutation.removedNodes.length)
      continue;
    mutation.target.loop = false;
  }
});
shortsObserver.observe(shorts, {attributes: true});

~meta

// ==UserScript==
// @name         YouTube Disable Autoplaying
// @version      1.0.2
// @description  Disable YouTube autoplaying everywhere.
// @author       Lumynous
// @license      MIT
// @match        https://www.youtube.com/*
// @noframes
// @downloadURL  https://gist.github.com/lumynou5/b036f405a0888bf9c3b9a3f560e36f3d/raw/youtube-disable-autoplaying.user.js
// @updateURL    https://gist.github.com/lumynou5/b036f405a0888bf9c3b9a3f560e36f3d/raw/~meta
// ==/UserScript==

了解，感謝^^