I opened Firefox 66.0.2 (64-bit) today and the Cyberpanel overview box…that is normally on left hand side of main content area, is covering the middle of the screen.
There is no way of moving it, closing it, or seeing what is behind it.
The only way to get rid of the issue is to click on the Cyberpanel log at top left , which removes the left hand side widget area altogether and consequently also minimises the misaligned OVerview widget (which isnt desirable for fast navigation).
I am thinking this is probably just a simple css issue…perhaps firefox webkit is missing?)
BTW, it happens on all client windows for me (i have not checked to see if admin has the same problem…i suspect it may)