Oh! I thought that Miranda NG wasn't being updated anymore.
There was plenty of updates! Hopefully, that will solve some crashes that I've had in the last months. Thank you Robyer!
Phew... I thought it was time to retire Miranda, after 15 years. But not yet!
Just as a note: to connect, I had to turn off Facebook's two step verification, connect with Miranda NG using Facebook's password (not app password), then I turned on again the two step verification.