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Why doesn't Twitch work in Firefox without Flash?

Wouldn't be surprised if Firefox doesn't have all the relevant hardware decode licences (MPEG-2 in this instance).

For a lot of codec related items support is dependent on the underlying OS, and I don't think Windows ships with a general MPEG-2 licence.

So again, it's about Apple being jerks and not supporting free codecs. However ffmpeg can decode it, and Firefox relies on it now.