Jquery sortable in contextMenu not working in mozilla firefox

Am working on jquery context menu with menu items are sortable using jquery sortable,

This working fine in Chrome but while working on Mozilla firefox context menu item sticks on to mouse cursor while sorting.

below is my code:

<!doctype html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>jQuery UI Sortable - Default functionality</title>
        <link rel="stylesheet" href="css/jquery.contextmenu.css">
        <link rel="stylesheet" href="css/jquery-ui.css">
        <script src="js/jquery-1.10.2.min.js"></script>
        <script src="js/jquery-ui.js"></script>
        <script src="js/jquery.contextMenu.js"></script>
    </head>
    <body>
        <button class="context-menu-one btn btn-primary" id="rightClickBtn">right click me</button>

        <script type="text/javascript">

            $(document).ready(function() {
                $( "#sortable" ).disableSelection();

                var items = {
                    first: {
                        name: "Item 1",
                        isHtmlName: true
                    },
                    second: {
                        name: "Item 2",
                        isHtmlName: true
                    },
                    third: {
                        name: "Item 3",
                        isHtmlName: true
                    }
                }

                $.contextMenu({
                    selector: '.context-menu-one',
                    autoHide: true,
                    items: items,
                    events: {
                        show: function() {
                            $('#sortable').sortable({
                                items:'li:not(.context-menu-header)'
                            });
                        }
                    }

            });

            $('.context-menu-one').mousedown(function(e){
                if(e.button == 2) {
                    $('ul.context-menu-list').attr('id', 'sortable');
                }
            });

        });
        </script>
    </body>
    </html>

Below image is getting while working on firefox:

untitled

you can see that context menu item is stick on to mouse cursor in firefox.

johnny / jquery-sortable

Jquery sortable in contextMenu not working in mozilla firefox #246