According to this article "https://adblockplus.org/blog/adblock-plus-and-the-canvas-fingerprinting-threat" by Wladimir Palant, lead developer at Adblock Plus, anyone who has EasyPrivacy filter list enabled in Adblock Plus is essentially protected from Canvas fingerprinting.

My question for developer of Canvas Defender is: Do you really need this extension if you are using Adblock Plus or Ublock Origin with EasyPrvacy enabled?

My rating of this extension is based solely on limited use in Firefox Nightly, which I have installed alongside Firefox beta. It did not seem to cause any new problems.