Add button to open steam app on the client

steam-client-link.user.js

// ==UserScript==
// @name         steam-client-link
// @description  Add button to open steam app on the client.
// @namespace    https://gist.github.com/mattkrins
// @homepageURL  https://gist.github.com/mattkrins/470652b0006db6024aa032e11cbcc05f
// @icon    https://store.steampowered.com/favicon.ico
// @version      1
// @description  Integrate web store with client.
// @author       Matt Krins
// @match        *://store.steampowered.com/app/*
// @grant        none
// @copyright    2018, mattkrins (https://gist.github.com/mattkrins/)
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';
    $J(document).ready( function () {
        let AppID = window.location.pathname.split("app/")[1].split("/")[0];
        let cartButton = $J(".btn_addtocart").first();
        console.log(cartButton)
        cartButton.clone().appendTo( cartButton.parent() ).find("a").prop("href", 'steam://run/'+AppID).find("span").text("Open");
    });
})();

Preview: