when a component extension is smaller than a certain threshold(guess 600px) and trigger mouse event upon it, then it gets transparent.
(still elements are there. I can see through dev tools)
How to reproduce
Set any component extension on a stream and resize video/browser size so that iframe size is shrunk responsively.
Then click any button on the extension -> invisible.
resize bigger -> visible
resize smaller again -> trigger mouse event -> invisible.
The contents inside an iframe should not become transparent.