Relevant comment for X11:
> (In reply to lilydjwg from comment #30)
>> I'm glad to here that, but what about support for Firefox on X11? Is it given up?
> Hardware decoding is platform independent so it generally works under X11 as it's implemented as Bug 1616185.
> For whole playback chain see Bug 1610199 what's needed to be done fox X11.
> I was closing this one as it refers to HW decode only, not the playback.
> The overall video playback is tracked at Bug 1210726.