Adoric embed to add current URL like a hidden field to the LB form.

<script>
    (function() {
    var DYNAMIC_URL_FIELD_NAME = 'leadPageUrl';
        var form = document.querySelector('.' + self.identifier + ' div[tabindex] form');

        function addHiddenInput(name, val) {
            var inp = document.createElement('INPUT');
            inp.type = 'hidden';
            inp.name = name;
            inp.value = val;
            if (form) {
                form.appendChild(inp);
            }
        }
        addHiddenInput(DYNAMIC_URL_FIELD_NAME, window.location.href);
    })();
</script>