I just updated FireFox (version 220.127.116.11 or something) & it opens up into a small box in the corner of the screen. No window.
I had to do a lot of hard dragging to get the windows to show. Actually when I 1st opened it, it refused to connect. Ah ... & now it wants we to update to 18.104.22.168
It seems like I've updated it about 3 times in the past few times I've logged on. Ok this one seems to open up properly for a change.