Add custom tab to featured image media library popup

Adding this snippet to the functions.php of your wordpress theme will add a new tab to the featured image popup called mime types. Clicking on this tab will display a list of the allowed file types however this could be changed to display almost any information.



function mime_type_tab($tabs) {
/* name of custom tab */
$new_tab = array('mimeframe' => __('Mime Types', 'mimetype'));
return array_merge($tabs, $new_tab);
add_filter('media_upload_tabs', 'mime_type_tab');
function create_mime_type_page() {
wp_enqueue_style( 'media' );
/* add custom code to display bellow this line */
/* display mime types */
$mimes = get_allowed_mime_types();
$types = array();
echo '<div class="type-outer">';
echo '<h3 class="media-title">Supported file types</h3>';
echo '<hr />';
foreach ($mimes as $ext => $mime) {
$types[] = '<li>' . str_replace('|', ', ', $ext) . '</li>';
echo '<ul class="mime-types">' . implode('', $types) . '</ul>';
echo '</div>';
/* end custom code */
function insert_mime_type_iframe() {
return wp_iframe( 'create_mime_type_page');
add_action('media_upload_mimeframe', 'insert_mime_type_iframe');
add_action( 'admin_head', 'mime_frame_css' );
function mime_frame_css() {
echo '<style type="text/css">
.type-outer hr{
border:solid #ccc;
border-width:0px 0px 1px 0px;
margin:0px 0px 20px 0px;
.mime-types li{

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