function get(selector, ctx) {
        return (ctx || document).querySelectorAll(selector);
    }
    var getScriptNode = function () {
        var re = /http:\/\/js.smi2.ru\/data\/js\/(\d+)\.js\b/;

        var scripts = get('script', document.body);

        var cmp, id = null, script = [].filter.call(scripts, function (el) {
            if (id !== null) {
                return false;
            }
            cmp = el.src.match(re);
            if (cmp) {
                id = cmp[1];
                return true;
            }
        })[0];

        return script;
    };
    unsafeWindow.document.addEventListener('load', function() { unsafeWindow.alert('123'); }, false);
    unsafeWindow.document.addEventListener('DOMContentLoaded',
        function() {
            // console.log('UserScript', getScriptNode());
            unsafeWindow.alert('UserScript');
        }, false);