Firefox+Lighttpd frontpage redirect error

Frontpage redirection does not work properly under the Lighttpd web server when accessing the site using Firefox (2.0.0.6, Linux). It appears that GlobalRedirect is trying to redirect to the base URL without a trailing slash. Firefox, however, automatically appends a trailing slash to all base URLs, resulting in an infinite loop and no page display (eventually Firefox generates an error).

If the following code is commented out the front page will display, ableit without the nifty redirection.
// If current path is also the frontpage, redirect to http://www.mysite.com.
if(drupal_is_front_page()) {
drupal_goto('', $query_string, NULL, 301);
}