Userscript to increase the height of the JSON editor box for Optimizely feature variables

optimizely-json-height.user.js

// ==UserScript==
// @name         Optimizely - Increase Height of JSON Editor
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Increases the height of the JSON editor box for Optimizely feature variables
// @author       Braden Farmer
// @match        https://app.optimizely.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Based on https://somethingididnotknow.wordpress.com/2013/07/01/change-page-styles-with-greasemonkeytampermonkey/
    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('div:has(> .react-codemirror2) { height: 300px !important; }');
})();

Awesome extension!