Any change of doing the following  in action.getfile.php (maybe via an option),
so PDF's are viewable within the browser.

$ext = substr($file, -3);
if ($ext == "pdf") {
        header('Content-Type: application/pdf');
        header("Content-Disposition:inline; filename=\"$bn\"" );
} else {
        header('Content-Type: application/octet-stream');
        header("Content-Disposition: attachment; filename=\"$bn\"" );
}