Viglink wordpress support sucks, an huge plugin that doesn't even work correctly

viglink.php

<?php
/*
Plugin Name: Viglink-easy
Description: Viglink wordpress support sucks, an huge plugin that doesn't even work correctly
*/
add_action('wp_footer', 'viglinkeasy');
function viglinkeasy(){
    ?>
    <script type="text/javascript">
      var vglnk = { key: 'x' };
      (function(d, t) {
        var s = d.createElement(t); s.type = 'text/javascript'; s.async = true;
        s.src = '//cdn.viglink.com/api/vglnk.js';
        var r = d.getElementsByTagName(t)[0]; r.parentNode.insertBefore(s, r);
      }(document, 'script'));
    </script>
    <?php
}