Remove the blue Facebook bar on new messenger page
// ==UserScript==
// @name OldMessenger
// @namespace http://example.com/temporary_namespace
// @version 0.1
// @description Remove the blue Facebook bar on new messenger page
// @author Eric Zhang
// @match https://www.facebook.com/messages/*
// @grant none
// ==/UserScript==
var fbBar = document.getElementById('pagelet_bluebar');
if (fbBar) fbBar.parentNode.removeChild(fbBar);