Because they're already done. Windows: https://bugzilla.mozilla.org/show_bug.cgi?id=922314 https://bugzilla.mozilla.org/show_bug.cgi?id=922314 Android: https:

Because they're already done. Windows: https://bugzilla.mozilla.org/show_bug.cgi?id=922314 https://bugzilla.mozilla.org/show_bug.cgi?id=922314 Android: https://bugzilla.mozilla.org/show_bug.cgi?id=986381 https://bugzilla.mozilla.org/show_bug.cgi?id=986381 Linux supports HW decoding via gstreamer, if you have gstreamer set up to use your hardware (this can take some work).