Mousehunt Birthday Auto Claim Crate

Auto Claim Crate during Birthday event

// ==UserScript==
// @name         Mousehunt Birthday Auto Claim Crate
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Auto Claim Crate during Birthday event
// @author       lobsterindustry
// @match        http://www.mousehuntgame.com/*
// @match        https://www.mousehuntgame.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=mousehuntgame.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    function claimCrate(){
        if (document.getElementsByClassName("superBrieFactoryHUD-claimButton")[0].clientHeight > 0){
            document.getElementsByClassName("superBrieFactoryHUD-claimButton")[0].onclick();
            setTimeout(document.getElementById("jsDialogClose").click(),20000);}
    }

    claimCrate();
    setInterval(claimCrate(), 600000);
})();