Tampermonkey script to fix the Github font-family

fix-github-font-family.js

// ==UserScript==
// @name         Fix Github Font-Family
// @version      0.2
// @description  Fix Github Font-Family
// @author       Alistair Brown <me@alistairjcbrown.com>
// @match        https://github.com/*
// @grant        none
// ==/UserScript==

(function() {
    var selectors = [
        'body',
        '.markdown-body',
        '.tooltipped::after',
        '.default-label .sha .ellipses'
    ];
    var styleNode = document.createElement('style');
    var styleText = document.createTextNode(selectors.join(', ') + ' { font-family: sans-serif !important; }');

    styleNode.type = "text/css";
    styleNode.appendChild(styleText);

    document.head.appendChild(styleNode);
})();