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The TOR browser simply blocks access to the canvas itself. Seems like a good addition to the "would you like to grant access to" list.

The patch for that has been already uplifted to Firefox and is behind the pref "privacy.resistFingerprinting": https://bugzilla.mozilla.org/show_bug.cgi?id=967895

By the way it's spelled "Tor" ;)

Tangentially, that's bothered me since it's "The Onion Router", and such abbreviations are typically capitalized.