Use system default fonts across the web
// ==UserScript==
// @name System Fonts
// @include http*
// @locale en
// @version 0.20
// @description Use system default fonts across the web
// @author Danny J Kendall (MANICX100)
// @grant none
// @namespace https://greasyfork.org/users/169145
// ==/UserScript==
var s = document.createElement("style");
s.type = "text/css";
s.textContent = "* { font-family: Bahnschrift, -apple-system,BlinkMacSystemFont, Roboto, Oxygen-Sans, Ubuntu, Cantarell, Droid Sans, Helvetica Neue, sans-serif !important; }";
document.head.appendChild(s);