Script to disable info messages on hipchat web

hipchat.user.js

// ==UserScript==
// @name         web hipchat changer
// @namespace    https://gist.github.com/spike886/7e33bd8caa4f6eaa7cd2
// @version      0.1
// @description  At the moment it just hiddes info messages
// @author       Andres
// @match        https://*.hipchat.com/chat
// @updateURL    https://gist.github.com/spike886/7e33bd8caa4f6eaa7cd2/raw/hipchat.user.js
// @grant        none
// ==/UserScript==
 
 
// common function in css to change css style
function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}


addGlobalStyle('.hc-msg-info {display: none;}');