tax-engine-custom-helper.user.js

// ==UserScript==
// @name         Custom Helper (Tax Engine) - Amazon iFrame Pass to mTurk Work Frame
// @namespace    salembeats
// @version      1
// @description  .
// @author       Cuyler Stuwe (salembeats)
// @include      *
// @grant        GM_info
// ==/UserScript==

if(window === window.top) {return;}
//if( !document.location.href.includes("amazon.com") || !document.referrer.includes("mturk") ) {return;}

//alert("helperrunning");

(function main() {
    document.addEventListener("keydown", function(event) {
        //var eventCopy = new KeyboardEvent('keydown', event);
        window.parent.postMessage({keypress: {keyCode: event.keyCode, key: event.key, which: event.which}}, "*");
    });
})();