212 reviews
  • The best!
  • Хорошее и полезное расширение. В версии 0.5.5 устранили баг и теперь всё Ок.
  • Please consider adding an UI element for adding/removing the site from the whitelist without having to manually edit the string in the settings. This UI should appear in the popup menu when the extension icon is clicked. This extension would be much more usable with this.

    UPDATE: This is great! As I mentioned on Github, I missed this because I'm not used to paying close attention to the icons in the address bar often since I'm using Tridactyl. I've updated my rating accordingly.
    This is already implemented. See my comment on https://github.com/kkapsner/CanvasBlocker/issues/285
  • The addon works perfectly. I tested all extensions for blocking canvas and this one definitely does the best job.
  • Hello, excellent program, for when a version for the Opera browser ??????
    A version for Opera or Chrome is not planned. They do not provide the necessary APIs to provide the same quality of protection.
  • It gets the job done.
    Didn't even know I need it until a web page started to abuse canvas to shove ads in your face
  • breaks webpages that require adobe flash on waterfox latest release
    Please open an issue at https://github.com/kkapsner/CanvasBlocker/issues with all your details and a reproduction scenario. There we can communicate way better.
  • What happened to the fingerprint icon up in the toolbar on android FF? It is now gone so how do I know if CB is functioning correctly?
    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
  • A must have privacy extension for everyone!
  • Tell me what you dislike about the new version. Without this information I cannot improve CB.
  • Great stuff. I think this should be a "featured extension" in the pivacy and security category.
  • Nice, but the toolbar icon changes color sometimes (red/green). What do the different colors mean?
    Green = I'm save, red = I'm not protected? And what do I have to do for it to protect me again?
    The color change just indicate that something was faked. It's some sort of notification and nothing to worry about.
  • I tested this addon with the Panopticlick test from the EFF, and when I check the 'full results' it shows that the hash values are changed every time I have the addon enabled. So I guess it's basically ruining it for people who use these values to track you.
    Exactly this is the idea behind the fake mode.
  • This extension doesn't work.


    Go see for yourself.
    It's fine to have a unique fingerprint as long it changes every time. If you re-test your browser you will see different canvas and webGL hashes.

    See the following issue for reference: https://github.com/kkapsner/CanvasBlocker/issues/154
  • It is great, but it'd be much better if the Mozilla Add-ons link embedded in it was language-agnostic. Currently, it is to the German version of the site.
    This issue will be fixed in the next version: https://github.com/kkapsner/CanvasBlocker/issues/219
  • Great, but seems to be blocking protonmail . . . tried whitelisting without success . . .

    Update: unchecked "Block data-URL pages" as suggested, and now works. Thanks!
    Please try the solutions mentioned on https://github.com/kkapsner/CanvasBlocker/issues/223
  • Funktioniert einwandfrei.
    Das Symbol wurde von Benutzern angefragt: https://github.com/kkapsner/CanvasBlocker/issues/217

    Man kann es ohne Probleme deaktivieren: darauf rechts klicken -> aus Symbolleiste entfernen