Why is this being removed? It's an essential feature and works great. Use case: pitchable DJ-player style use, akin to how a record player works. All browsers should implement it.
It is a proprietary feature with no known plans from other vendors to support it (certainly not with a "moz" prefix). If there's a reason to assume that this will be specified and other browsers will implement it unprefixed, we'll probably add the unprefixed API before removing the prefixed one, though.
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