The fingerprint icon should be present if you have notifications enabled and something was faked on the page.

You can check if CB is working on the test pages (e.g. https://canvasblocker.kkapsner.de/test/test.html - the hashes should change on reload).

Please open an issue at https://github.com/kkapsner/CanvasBlocker/issues - there we can discuss better.

This issue is solved in 0.5.5