TamperMonkey Script for Gmail Layout

tampermonkey-script-gmail.txt

// ==UserScript==
// @name Gmail Font Type and Size
// @include https://mail.google.com/mail*
// @description Set Gmail font to classic view
// @version 1.0
// ==/UserScript==

(function() {
'use strict';
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('.gmail_default {font-family: Lucida Grande!important;}');
addGlobalStyle('.aoT {font-family: Lucida Grande!important;}');

})();