Disable YouTube profile video's auto play while keep auto play feature on normal video play.

disable-youtube-auto-play-on-profile.user.js

// ==UserScript==
// @name         Pause YouTube Videos on Profile Pages
// @namespace    http://tampermonkey.net/
// @version      1.7
// @description  Pause YouTube videos on profile pages while keeping autoplay on for video pages
// @author       CYTsai
// @match        https://www.youtube.com/*
// @grant        none
// @icon         https://www.google.com/s2/favicons?domain=youtube.com
// @downloadURL  https://gist.github.com/cytsai1008/555d5796f319cce5929f9ada034e5190/raw/disable-youtube-auto-play-on-profile.user.js
// @updateURL    https://gist.github.com/cytsai1008/555d5796f319cce5929f9ada034e5190/raw/disable-youtube-auto-play-on-profile.user.js
// ==/UserScript==

(function() {
    'use strict';

    function pauseVideo() {
        let video = document.querySelector('video');
        if (video) {
            video.addEventListener('loadeddata', function() {
                if (!video.paused) {
                    video.pause();
                }
            });
        }
    }


    function checkUrlAndPauseVideo() {
        let url = window.location.href;
        let isUserProfilePage = /^https:\/\/www\.youtube\.com\/(user|channel|c|[^\/]+)$/.test(url) && !url.includes('/watch?') && !url.includes('/embed/');
        if (isUserProfilePage) {
            console.log("User Profile detected.");
            pauseVideo();
        }
    }

    let previousUrl = window.location.href;
    function handleNavigation() {
        const currentUrl = window.location.href;
        if (currentUrl !== previousUrl) {
            previousUrl = currentUrl;
            checkUrlAndPauseVideo();
        }
    }

    const observer = new MutationObserver(handleNavigation);
    observer.observe(document.body, { childList: true, subtree: true });

    window.addEventListener('yt-navigate-finish', handleNavigation);
    window.addEventListener('load', checkUrlAndPauseVideo);
    checkUrlAndPauseVideo();
})();