I cant seem to find any recent discussion on this and was hoping there has been some changes. For now, there is no obvious way other than to do so through task manager.
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add browser object
action browser-> quit/exit
add browser object action browser-> quit/exit
This ^^
And also if you are just testing without the windows borders, and need a quick way out ALT-F4 works.
Oh, I see. The action is "Close". I will give that a whirl here in a bit. Thank you!