window.addEventListener('test-getvalue', function (ev) {
        if (ev.detail.deferred && ev.detail.key)
            ev.detail.deferred.resolve(GM_getValue(ev.detail.key, ev.detail.defalt));
    });

    window.addEventListener('test-setvalue', function (ev) {
        if (ev.detail.key)
            GM_setValue(ev.detail.key, ev.detail.value);
    });

    let script = document.createElement('script');
    script.type = 'text/javascript';
    script.textContent = `(${MakeTest.toString()})()`;
    document.body.appendChild(script);

    function MakeTest () {

        window.Test = {
            store: store,
            load: load
        };

        function store (key, value) {
            window.dispatchEvent(new CustomEvent('test-setvalue', { detail: {
                key: key,
                value: value
            }}));
        }

        function load (key, defalt) {
            return $.Deferred(function (deferred) {
                window.dispatchEvent(new CustomEvent('test-getvalue', { detail: {
                    deferred: deferred,
                    key: key,
                    defalt: defalt
                }}));
            });
        }

    }