No extensions that randomly change your fingerprint? I suppose that might trigger a lot of captchas.

There are but I'm not aware of anything that can reliably fool creepjs.

https://abrahamjuliot.github.io/creepjs/

And yes it often results in endless captcha loops.

Fingerprinting can be extremely sophisticated. Have a look at this test: https://coveryourtracks.eff.org/

Only Tor Browser can reliably fight with it.

Tor Browser will not even hide the OS you're using from javascript... so if you're on Linux, you are automatically more identifiable than >97% of people.

Also, that EFF site only checks against other people who visited the same site, so the results are skewed IMO. The other comment that links to creepjs is what I consider the best available open source tool.

Yes, the anonymization is not perfect but it's the best you can get.

You don't have to compare your fingerprint with other visitors. Just have a look at the detailed information to understand which things reveal your identity the most.