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There is an about:config setting called privacy.resistFingerprinting that does a handful of things, I believe including canvas fingerprinting. It also disables site specific zoom though (as that could be used for fingerprinting) which I find rather annoying.

I don't think the poster is correct about this.

Among other reasons, there is no "profit" from fingerprinting the browser. Fingerprinting the user allows for collecting user data that can be sold. Fingerprinting the browser has no such benefits -- the browser checks are usually done so that site "looks good" for an average user, and the amount of users who use rare browsers _and_ spoof their user agents is too small to care about.

Blocking canvas fingerprinting makes you stand out like a firework, in fingerprinting terms.