Sorry folks, but this is a new one.
I am zoomed out a fair bit and am dragging the window around. (The view)
I get this request popping up.
See attached and note red rectangle around request.
I can't capture screen "correctly" (as in with mouse and all the other stuff) but I hope this is good enough to help anyone understand what is happening.
The only way to get around it is (so far) to zoom in a bit then drag the scroll bars.
Once, it locked up the window (Browser) and I had to refresh to get it working again.