[eldod]

I don't think MSE is yet enabled on Firefox mobile, it was not working the last time I tested.

It says unsupported here, I guess this one is up to date: https://developer.mozilla.org/en-US/docs/Web/API/MediaSource

[cpeterso]

MSE has been available on Android since Firefox 41 (bug 1084456). That MDN page was out of date. Thanks for pointing out the error! I just updated it. :)

https://bugzilla.mozilla.org/show_bug.cgi?id=1084456