Highlight the comment box
// ==UserScript==
// @name Focus Comment Box
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Highlight the comment box
// @author Alex Kwon
// @match https://www.facebook.com/groups/gmymu/permalink/*
// @grant none
// @require https://cdnjs.cloudflare.com/ajax/libs/mousetrap/1.4.6/mousetrap.min.js
// ==/UserScript==
(function() {
Mousetrap.bind('f4', async function() {
const mybox = document.querySelector('[role="textbox"]');
mybox.focus();
});
})();