DialogBox Action Button not working in Firefox

[prashant-93]

My DialogBox is working fine with FireFox but the action button in the dialog box aren't working

(function() {
        var dialog = document.querySelector('#otpDialog');
        var showDialogButton = document.querySelector('#show-dialog');
       // var closeDialogButton = document.querySelector('.close');
        //alert("Dialogue is "+dialog);
        if (! dialog.showModal) {
          dialogPolyfill.registerDialog(dialog);
        }
        showDialogButton.addEventListener('click', function() {
          dialog.showModal();
        });

        dialog.querySelector('.close').addEventListener('click', function() {
          dialog.close();
        });
    }());