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M = Milestone, M91 is major version 91 More info at https://chromium.googlesource.com/chromium/src/+/refs/heads/...

I mistook it for Apple M1 chip and got very confused why there was no benchmark or mention of Apple silicon.

They actually did mention M1 in the post

> For some CPUs, calling functions that are further away from your generated code can cause CPU-internal optimizations (such as branch prediction logic) to fail. The fix for this is to copy the builtin functions into the same memory region as the generated code. This change is especially impactful for the new Apple M1 chip.

It's what they call the releases of Chrome — M91 is version 91.

I think the number of comments here asking about the M indicate that it really is obscure jargon. The Chrome release blog doesn't use the M consistently, about:chrome doesn't use the M, and the M doesn't appear in the user agent string.

If they just had said Chrome 91 everyone would have been ok.