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The specs that firefox chooses not to implement are stuff like web midi for security concerns. Firefox does not try to market itself as a "website viewer" that does not support "web apps"

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You must have missed the announcement. Firefox now supports web midi, their security concerns where BS all along anyway.

I can't speak on the specific details of web midi, but after the spate of poorly designed browser features with intrinsic security vulnerabilities (eg canvas fingerprinting), it's reasonable to be wary of things coming down the pipeline.

That always makes good sense. I think Chrome got this one right though, have a reasonable protection against abuse and trust that the end user is capable of weighing the risks.

Really, there isn't an issue around fingerprinting? https://twitter.com/denschub/status/1582730985778556931

The issue around fingerprinting is secondary because it isn't a security issue but a privacy issue, and this is a problem anyway for which there isn't a really good technical solution.

The security issues that were mentioned (someone bricking synths on purpose via SysEx messages) has afaik never actually happened.

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