BlurHash does not work when `privacy.resistFingerprinting` is enabled

In Firefox, when the option privacy.resistFingerprinting is enabled, BlutHash stops working. In the dev console, the following message is printed:

Blocked https://blurha.sh/ from extracting canvas data because no user input was detected

The reason I've enabled privacy.resistFingerprinting in about:config is to make it harder for advertisers to track myself. To see fingerprinting in action, visit fingerprint.com in normal and privacy mode, and compare the generated visitor id.