{
  "slug": "canvas-fingerprint-blocker",
  "category": "browser-extensions",
  "name": "Canvas Fingerprint Blocker",
  "description": "Browser extension that adds noise to HTML5 canvas output to resist canvas fingerprinting without disabling the canvas element.",
  "website": "https://webextension.org/listing/canvas-fingerprint-blocker.html",
  "source": "https://github.com/joue-quroi/canvas-fingerprint-blocker",
  "license": null,
  "platforms": [],
  "jurisdiction": null,
  "pick": false,
  "pick_reason": null,
  "disclosure": null,
  "grade": "F",
  "score": 30,
  "coverage": 100,
  "summary": "Canvas Fingerprint Blocker scores 30 out of 100 (grade F) on the browser extensions criteria. It meets 1 of 4 criteria: open source. It does not meet no trackers or telemetry, no ads or data sales and independent audit.",
  "url": "https://privacyratings.com/browser-extensions/canvas-fingerprint-blocker/",
  "markdown": "https://privacyratings.com/browser-extensions/canvas-fingerprint-blocker/index.md",
  "answers": {
    "open_source": {
      "title": "Open source",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://addons.mozilla.org/en-US/firefox/addon/canvas-blocker-no-fingerprint/",
      "note": "Released under MPL-2.0 on the add-on listing; the source repository itself has no license file."
    },
    "no_trackers": {
      "title": "No trackers or telemetry",
      "weight": 3,
      "answer": "no",
      "evidence": null,
      "note": "The home page loads Google AdSense, Google Analytics and Google Tag Manager (automated test)."
    },
    "no_ads": {
      "title": "No ads or data sales",
      "weight": 2,
      "answer": "no",
      "evidence": null,
      "note": "The project website shows Google AdSense ads."
    },
    "independent_audit": {
      "title": "Independent audit",
      "weight": 2,
      "answer": "no",
      "evidence": null,
      "note": "No independent audit is published."
    },
    "transparency_report": {
      "title": "Transparency report",
      "weight": 2,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "user_notice": {
      "title": "Tells users about requests",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "tls": {
      "title": "TLS configuration",
      "weight": 2,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "security_headers": {
      "title": "Security headers",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "web_standards": {
      "title": "Modern web standards",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    }
  },
  "tests": {
    "ssllabs": null,
    "observatory": null,
    "internetnl_web": null,
    "internetnl_mail": null,
    "trackers": [
      {
        "name": "Cloudflare Web Analytics",
        "host": "static.cloudflareinsights.com",
        "effect": "partial"
      },
      {
        "name": "Google AdSense",
        "host": "pagead2.googlesyndication.com",
        "effect": "no"
      },
      {
        "name": "Google Analytics",
        "host": "inline code",
        "effect": "no"
      },
      {
        "name": "Google reCAPTCHA",
        "host": "www.google.com",
        "effect": "none"
      },
      {
        "name": "Google Tag Manager",
        "host": "www.googletagmanager.com",
        "effect": "no"
      }
    ],
    "tested_at": "2026-10-01T10:59:35.747Z"
  },
  "last_modified": "2026-10-01T11:14:42Z"
}