Yes, Firefox already provides some protection against fingerprinting.
Firefox
A community for discussion about Mozilla Firefox.
I'm not sure if resistFingerprinting does anything to stop websites from uploading whatever data they can get though, I don't think it does that. And I don't think it could really do that in the first place since the website could just obfuscate the data and browser wouldn't know what is sent.
No defense is perfect, of course. To prevent client-side code from running, you can always install NoScript.
Privacy is an endless treadmill, though; they are always finding new ways to get around protection. You may get a good level or privacy with the right tools, but it will also be super inconvenient.
On Firefox 127.0.2 (64-bit)
https://www.amiunique.org/fingerprint
"Yes! You are unique among the 2702674 fingerprints in our entire dataset. "
Lists plugins, list of fonts (JS), and more.