Canvas works even if privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts is enabled on TBB 8.0, is that normal ?

You can test with this. https://smashcat.org/av/canvas_test/


If you configure "privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts" to "false" you improve your privacy disabling the automatically inputs don´t requested by user of canvas and do not disable it itself, that is, canvas keeps rolling with reduced chances of fingerprint analysis. The cost of disable is the drop of canvas performance, you can see this in the same test you posted:

Canvas auto input enable (Better performance option): enter image description here

Canvas auto input disable (Better privacy option): enter image description here

With the auto-input disabled the web page always asks if you want to activate it:

enter image description here

  • With privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts set to true, I get >200 fps in that same canvas test (smashcat.org).
    – Alex
    Mar 22 '20 at 16:05

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.