investigate browser's use of the MediaControl API (Windows)

From #33534 (closed): Firefox 75 added support for Windows' MediaControl API. Maybe this means the browser will tell Windows what audio or video is playing in the browser? We should investigate.

https://bugzilla.mozilla.org/show_bug.cgi?id=1584501
"[MediaControl-Windows] Implement the SystemMediaTransportControls for Windows"

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