Hmm... the `AppleDecoderModule` only claims to support VP9 when we can ensure it's hardware accelerated, which we can only do in macOS 11+. I'll see if we can relax this and use a software decode path if that's all we can get.
Bug 1763781 Comment 4 Edit History
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Hmm... the [`AppleDecoderModule` only claims to support VP9 when we can ensure it's hardware accelerated](https://searchfox.org/mozilla-central/rev/2c4522f76b23b024d9f29e140d41042853874c07/dom/media/platforms/apple/AppleDecoderModule.cpp#43), which we can only do in macOS 11+. I'll see if we can relax this and use a software decode path if that's all we can get.