Not really something new… Firefox already does this under its built-in strict enhanced tracking protection.

Manually setting it on firefox:

about: config privacy.resistFingerprinting true

I use LibreWolf, where it’s enabled by default. Unfortunately, it broke a few sites for me. I recall two specific cases one a furniture store site with a 3D product viewer that stopped working, and an airline website that showed graphic glitches when I tried to print my ticket