There is an error in the JavaScript shell but only showing for some seconds:
Unsafe JavaScript attempt to access frame with URL
https://www.facebook.com/dialog/oauth?access_token=[TOKEN]&api_key=[API-KEY]&app_id=[API-ID]&client_id=[CLIENT-ID]&display=popup&domain=n1da.net&locale=de_DE&origin=1&redirect_uri=http%3A%2F%2Fstatic.ak.facebook.com%2Fconnect%2Fxd_arbiter.php%3Fversion%3D8%23cb%3Df1682e527c%26origin%3Dhttp%253A%252F%252Fn1da.net%252Ff18c9b60f8%26domain%3Dn1da.net%26relation%3Dopener%26frame%3Df373724944&response_type=token%2Csigned_request&scope=manage_pages%2C%20publish_actions%2C%20publish_stream&sdk=joey
from frame with URL
https://n1da.net/wordpress/wp-admin/admin.php?page=facebook-settings&fb_extended_token=1&settings-updated=true.
Domains, protocols and ports must match.
I got same result for Chrome and Firefox ??