これを使うとサイト表示が崩れる　うんこ

Unfortunately, it doesn't work using FF 62.0.3

Shows up with same Fingerprint when using Browserleaks.com

This addon does not change the canvas fingerprint, at least not the one tested on browserleaks.com
About the people complaining about the fingerprint being unique: If an extension changes the fingerprint it is still unique but not persistent which makes you less traceable.

Does not make my canvas fingerprint less unique according to panopticlick. I'm still 1 in 1.9M, which is pretty bloody unique.

Yes, I've closed and reopened the tab, I've done Shift+F5 (which opens the devtools?) and everything. The result stays the same: this addon doesn't appear to do anything.

It's not working. Tested on https://browserleaks.com/canvas my fingerprint remain the same as without this extension.
Still not working. Maybe a conflict with an other addon privacy/security oriented. I don't want to disable them so I found another solution working for me. Thank you.