Custom fixed-font in Gmail messages
// ==UserScript==
// @name Custom Fixed Font in Gmail
// @namespace https://mail.google.com
// @include https://mail.google.com/*
// @icon https://mail.google.com/favicon.ico
// @run-at document-start
// @description Custom fixed-font in Gmail messages
// @version 1.1
// @homepageURL https://github.com/lidel/userscripts
// @grant none
// ==/UserScript==
var fontName = 'Droid Sans Mono';
var fontSubset = 'latin';
// dragons below this line
var fontCss = 'font-family: \'' + fontName + '\', monospace !important;';
// plain-text messages
var css = '.ii, .Ak {' + fontCss + '}';
// editor
css += '.editable {' + fontCss + '}';
// load
var heads = document.getElementsByTagName('head');
if (heads.length > 0) {
var link = document.createElement('link');
link.rel = 'stylesheet';
link.href = '//fonts.googleapis.com/css?family=' + fontName.replace(/\ /g, '+') + '&subset=' + fontSubset;
heads[0].appendChild(link);
var node = document.createElement('style');
node.type = 'text/css';
node.appendChild(document.createTextNode(css));
heads[0].appendChild(node);
}