Hookpad Scroll Fix.user.js

// ==UserScript==
// @name         Hookpad scroll fix
// @namespace    http://github.com/lucasjones
// @version      0.1
// @description  Fix scrolling on hookpad
// @author       Lucas Jones
// @match        http*://www.hooktheory.com/hookpad/app*
// @grant        none
// ==/UserScript==

(function() {
    console.log("Fixing hookpad scroll...");
    var style = document.createElement('style');
    style.innerHTML =
        '.app-content {' +
            'overflow-y: auto;' +
        '}';

    var ref = document.querySelector('script');
    ref.parentNode.insertBefore(style, ref);
})();