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I wonder how unique this fingerprint really is. Getting the same fingerprint every time is only half of what makes a good fingerprint.

Fennec on Android: cdec914cb91d1a88fbd3e7834b7968c8

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Agreed. It's not a "fingerprint" at all as in most cases, it won't be remotely unique.

For example: every user in the world with the same screen size, browser & platform will get the same result. For desktop it's window size rather than screen, but coarsely bucketed.

Thousands or millions will share the same fingerprint. It seems somewhat unrealistic to ascribe much advertisement or tracking value to this.

But this are not the only info. OS language, dark mode preferences, fonts installed, all this stuff goes a long way in helping pinpointing you.

Yep, this site should tell you if your fingerprint is unique among all the other visitors, like other fingerprint sites do. I know a positive would only be meaningful if the website gets popular, but a negative would say a lot regardless.

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