YTLC-AutoSwitch.meta.js

// ==UserScript==
// @name            YTLC Auto Switch
// @namespace       ytlc-auto-switch
// @version         1.0.2
// @description     Just auto switches to live chat instead of top chat
// @author          Pepijn98
// @match           https://www.youtube.com/*
// @grant           none

// @homepageURL https://github.com/Pepijn98
// @supportURL https://github.com/Pepijn98
// @updateURL https://gist.githubusercontent.com/Pepijn98/9c2f6eed61ec68f399022237d640406c/raw/YTLC-AutoSwitch.meta.js
// @downloadURL https://gist.githubusercontent.com/Pepijn98/9c2f6eed61ec68f399022237d640406c/raw/YTLC-AutoSwitch.user.js

// @run-at document-idle
// ==/UserScript==

YTLC-AutoSwitch.user.js

// ==UserScript==
// @name            YTLC Auto Switch
// @namespace       ytlc-auto-switch
// @version         1.0.2
// @description     Just auto switches to live chat instead of top chat
// @author          Pepijn98
// @match           https://www.youtube.com/*
// @grant           none

// @homepageURL https://github.com/Pepijn98
// @supportURL https://github.com/Pepijn98
// @updateURL https://gist.githubusercontent.com/Pepijn98/9c2f6eed61ec68f399022237d640406c/raw/YTLC-AutoSwitch.meta.js
// @downloadURL https://gist.githubusercontent.com/Pepijn98/9c2f6eed61ec68f399022237d640406c/raw/YTLC-AutoSwitch.user.js

// @run-at document-idle
// ==/UserScript==

(function() {
    'use strict';

    var elements = document.getElementsByTagName("yt-live-chat-app");
    if (elements.length >= 1) {
        var btn = document.querySelector("a[class='yt-simple-endpoint style-scope yt-dropdown-menu']");
        if (btn) btn.click();
    }
})();