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Well the method by which this Chromecast extension works is using the API for communicating with a desktop application.

It should be possible to do a similar thing for airplay.

Someone needs to find a library that can act as a Airplay Client and then build that into an extension

A quick Google shows this list of clients:

As far as I know, there is no open source client that can do the encryption handshake required to send an AirPlay mirroring stream.

My understanding is that everytime someone figures out how to open up airplay, apple goes and "fixes" it.

VLC is on-track to add AirPlay support soon, so at least there will be an open source library they could use.