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<?php

// source: https://gist.github.com/cliffordp/f4f775d360aeca82e6a2
add_filter( 'the_content', 'tec_forum_1036621_show_allowed_mime_types' );
function tec_forum_1036621_show_allowed_mime_types( $content ) {
  if ( current_user_can( 'manage_options' ) ) { // user is an administrator
    var_dump( get_allowed_mime_types() ); // https://developer.wordpress.org/reference/functions/get_allowed_mime_types/
  }
  return $content;
}