/**
* Display a list of extractors
* @return void
*/
static function extractors()
{
global $app;
$app->render('head.tpl', array('class' => 'extractors'));
$app->render('header.tpl');
$app->render('logo.tpl');
$app->render('extractors.tpl', array('extractors' => VideoDownload::listExtractors()));
$app->render('footer.tpl');
}