private function linkConfig(ResolvedExtension $extension)
    {
        $file = $this->app['filesystem']->getFile(strtolower("extensions_config://{$extension->getName()}.{$extension->getVendor()}.yml"));
        if ($file->exists()) {
            return $this->app['url_generator']->generate('fileedit', ['namespace' => $file->getMountPoint(), 'file' => $file->getPath()]);
        }

        return null;
    }