Since the update, if I switch tabs during a game and pass my cursor over the trash box after returning, the trash pop-up appears and must be closed via the X. To be clear, this happens when I return from another tab, move my cursor from the tabs in my browser to the game, and happen to pass over the trash box. If I am within the game and hover over the trash box, it behaves as expected, appearing then disappearing when the cursor is moved away from the trash.
Thanks for the report!
This has been mentioned on discord already. It looks like positioning the trash on the top right of the window might have unintended consequences. I've forwarded this.