There's really a lot more you can look at here. Lot's a prior art on super-cookies and fingerprinting:

https://coveryourtracks.eff.org/

https://amiunique.org/

Hmm interesting. I tried the EFF site and among other things it told me I'm on "MacIntel".

Gave me a scare, thought I'm still somehow running an x86 build of Firefox.

Both linked in the Sources & Confessions modal at the bottom. Cover Your Tracks is the spiritual ancestor of this whole piece. amiunique is more rigorous; this is the editorial cousin.

Another info leakage feedback tool:

https://www.ipleak.com/full-report/