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.