use firefox2 to open http://test.webrtc.org

then click Right-top: START, will get below:

Then to disable the playback device as below:
make sure you get:
then refresh 

http://test.webrtc.org  on FF52:

you will get below, and on UI popup to let the user to Allow. 
And close FF, restart FF, FF background process will not be closed.



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