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Disable comments on nicolive video screen

ニコニコ動画

// ==UserScript==
// @name         Disable comments on nicolive video screen
// @version      0.1
// @description  ニコニコ動画  
// @author       Werner78
// @match        https://live2.nicovideo.jp/watch/*
// @namespace    https://greasyfork.org/de/users/414179-werner78
// @grant        none
// ==/UserScript==

setTimeout(function(){
document.querySelector('button[class*="comment-button"]').click();
}, 9000);