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When will Firefox support the Media-Source-Extensions, and with no problem?

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When will Firefox support the Media-Source-Extensions, and with no problem?

It crashed when I was watching a live show in 1080p with HTML5. It usually have the tearing problem when it was in fullscreen with HTML5. It can't watch a 4K video while playing with HTML5.

When will Firefox support the Media-Source-Extensions, and with no problem? It crashed when I was watching a live show in 1080p with HTML5. It usually have the tearing problem when it was in fullscreen with HTML5. It can't watch a 4K video while playing with HTML5.

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It's being worked on, last version Mozilla added MSE for YouTube playback support to Mac OS X. I do not have an eta when this will be completed.