I'm guessing that most people who visits a website called "My browser fingerprint" with a domain of "amiunique.org" has at least a fleeting interest in privacy and making choices around that. And that group is most likely biased to using Firefox instead of Google Chrome, at least compared to a general section of the population.

The EFF version also tells you for each metric how (dis)similar you are from other users/devices. Or at least it’s supposed to - for one of them which was supposed to be a true/false boolean test, it said my browser revealed -1.00 bits of information and shared its value for that test with 1 out of every 1 device they saw.

I don't really get that "unique" fingerprint

Sure I'm unique. I try it in private mode.

> Your browser fingerprint appears to be unique among the 180,370 tested in the past 45 days.

Close down the window, switch VPN endpoint, and retry, and once again I'm unique.

> Your browser fingerprint appears to be unique among the 180,381 tested in the past 45 days.

Looking at the values it seems they are identical. How do they know that the two tests are the same user

If I try outside of private mode I see differences in DNT (set to true in private mode, false in not private mode) and in Hardware Concurrency (4 in private mode, 2 in non-private mode). The rest of the entries are the same.

Nethertheless

"Our tests indicate that you have strong protection against Web tracking."