Hey everyone, good news… I finally got Facebook Messenger cloning to work and even without the sandboxing necessary for WhatsApp. So it’ll be just a normal clone with all the modification options available.
On Android 5.0 or later the signup process is totally smooth but with older Android versions you will see errors during signup. However, after trying again, it should then work.
Notifications, chat heads and inline replies all appear to work correctly, at least on my device. I don’t really use Facebook Messenger, so there might be features which I’ve not tested that don’t work. I’ll do some more testing but you can probably expect this feature in the next update.