Well.. It has finally come to pass. Facebook doesn't operate
100% with FireFox 52.8.0 or Opera 36.
The dynamics required to start a message in the Messenger panel
for replies doesn't work. The cursor might sit blinking in the
message field, but there is no reponse with keystrokes.
As much as I lothe using FB, it is however the only way to
reach (or spy on) some friends or relatives.