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Browsers stopped reporting "real" user agents a long time ago as fingerprinting protection.
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Firefox reports correctly.
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Not on macOS at least, the Firefox user agent on my uptodate M1 MBP says that I'm on "Intel Mac OS X 10.15".

PS: and on my Win11 machine Firefox says that I'm on 'Windows NT 10.0', which AFAIK is the same NT version that was also reported on Win10.

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And on Linux it says you're on "X11" even if you're a proud Wayland session user!
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All the Mac browsers report as Intel even on Apple Silicon to reduce fingerprinting/avoid being detected as PowerPC
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