Giving up umatrix would be hard, but maybe this'd replace DDG for my "I just need this site to work right now" browser 🤔

Other than that the site can tell it is Librewolf.
Although, I opened amiunique.org in 2 different ways and the audio data and canvas footprints were showing up to be unique in both. So unless they are randomising it on every start, it is not standard enough.

While on firefox (on a close enough version), the Audio data was coming unsupported, which made it ~30% similarity ratio. On checking now though, the Audio data is visible with firefox.

What made my browser unique was the Canvas and the List of fonts. The latter tends to change every now and then without me doing anything special, because I just downloaded too many fonts.