How to block Facebook and allow only Messenger?

Question

I have successfully blocked Facebook and add exception to www.messenger.com. 
 However, Messenger page displays blank white page but no error encountered. 
 Can you show me some configurations guys. Please help.

Jelle · Answer

Hi, 
 seems that it is missing styles so I guess the stylesheets (CSS) are loaded from the facebook website. Look into the source of the messenger website and try to locate from where css is loaded.