The goal should not be to not be fingerprinted since that is a data point in itself, rather the goal should be to appear as a different browser after a short amount of time. There are extensions for Firefox that generate a new "fingerprint" periodically, e.g. 5 mins, for canvas, fonts, audio. Technically they don't generate the actual fingerprint, they add noise to the information that trackers use to generate the fingerprint.

So even if your fingerprint is unique, it would be a new unique fingerprint every 5 minutes. Maybe there's a logical fault with this plan, but, so far, I'm not seeing it.