I did install manually the latest 16.1.14.0 and then restarted the laptop. I click the Firefox icon, it opens for a brief moment and then closes again... BUT... for the very first time I got a pop up message (attached screenshot).
So I have to check this issue in Safe Mode and I will come back to tell you.
p.s.: I did try though both "Open" and "Refresh" options but nothing changed