I'll gladly change my rating if this is shown to be user error but I disabled every other add-on in Firefox except CanvasBlocker, went to browserleaks.com/canvas and ran the test, and the Fingerprint "Signature" field always stays the same no matter what. If I uninstall CanvasBlocker, it's the EXACT same signature as when the extension is installed. I have used the default settings and I have also tried tweaking the settings. The signature NEVER changes.