Firefox vs. Safari?

This is an odd one.

I am a Firefox user and have all the usual extensions:

• ABP

• Decentraleyes

• Ghosterey

• Privacy Badger

• UBlock Origin

• TrackMeNot

I also have vanilla Safari installed.

Here's the weird thing. Running both browsers through https://coveryourtracks.eff.org/ to see which one is trackable. Surprise, on both my phone and computer, Safari is not trackable but Firefox is. My Firefox has a unique fingerprint, Safari does not... it has "partial protection" i.e. one in ~ 15k browsers has the same fingerprint. Still better than unique.

I tried turning various extensions off and on, checking the result with only one anti-tracking extension active at a time. Same result.

What am I missing? I love Firefox and support the Mozilla Foundation. Yet Safari is getting me more online privacy?