youtube-plus.js improves YouTube's tracking of watched videos

You can

• Mark video as watched
• Hide watched videos
• Cloud sync your list

Wiki

Start using it

Add the following script to any browser UserScript extension.

// ==UserScript==
// @name           YouTube Plus
// @description    Improve YouTube's tracking of watched videos
// @author         Ítalo Andrade
// @include        *www.youtube.com/*
// @version        latest
// ==/UserScript==

;(async () => {
  const youtubePlus = await fetch(
    "https://youtube-plus.italodeandra.de/youtube-plus.js"
  ).then((res) => res.text())
  eval(youtubePlus)
})()

You don't need to manually update on future releases.