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We are also doing a spec so that it works in all browsers:

https://mediasession.spec.whatwg.org/

There's also a chrome extension "Media Keys by Sway.fm"[1]. It can scrobble to last.fm and pause videos/music in other tabs when you start playing something else.

[1] https://chrome.google.com/webstore/detail/media-keys-by-sway...

Or Keysocket which is FOSS (Apache license).

https://github.com/borismus/keysocket

Is anybody aware of plans for a web API to allow reassignment of media keys? Clearly it would require strict permissions so as not to be abused, but it could be really useful.