{
  "slug": "firefox",
  "category": "browsers",
  "name": "Firefox",
  "description": "Mozilla's open-source browser, built on its own Gecko engine rather than Chromium. Supports a wide range of extensions and extensive customization.",
  "website": "https://www.firefox.com",
  "source": "https://github.com/mozilla-firefox/firefox",
  "license": null,
  "platforms": [],
  "jurisdiction": {
    "code": "US",
    "name": "United States",
    "eyes": "Five Eyes",
    "eu": false,
    "gdpr": false,
    "cloud_act": "provider"
  },
  "pick": false,
  "pick_reason": null,
  "disclosure": null,
  "grade": "D",
  "score": 48,
  "coverage": 100,
  "summary": "Firefox scores 48 out of 100 (grade D) on the browsers criteria. It meets 2 of 8 criteria: open source and timely security updates. It partly meets blocks trackers by default, fingerprinting protection and no calls to big-tech services. It does not meet no trackers or telemetry, no ads or data sales and independent audit. It is based in the United States: Five Eyes member; subject to the US CLOUD Act.",
  "url": "https://privacyratings.com/browsers/firefox/",
  "markdown": "https://privacyratings.com/browsers/firefox/index.md",
  "answers": {
    "open_source": {
      "title": "Open source",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://github.com/mozilla-firefox/firefox/blob/main/LICENSE",
      "note": "MPL-2.0."
    },
    "no_trackers": {
      "title": "No trackers or telemetry",
      "weight": 3,
      "answer": "no",
      "evidence": "https://www.mozilla.org/en-US/privacy/firefox/",
      "note": "The home page loads Google Tag Manager (automated test), and the browser sends technical and interaction telemetry by default."
    },
    "no_ads": {
      "title": "No ads or data sales",
      "weight": 2,
      "answer": "no",
      "evidence": "https://www.mozilla.org/en-US/privacy/firefox/",
      "note": "Shows sponsored content on the New Tab page by default and shares de-identified data with advertising partners. Mainly funded by search engine deals."
    },
    "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."
    },
    "tracker_blocking": {
      "title": "Blocks trackers by default",
      "weight": 3,
      "answer": "partial",
      "evidence": "https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop",
      "note": "Blocks social media trackers, cross-site tracking cookies, cryptominers and known fingerprinters by default, but tracking content only in private windows or Strict mode."
    },
    "fingerprinting_protection": {
      "title": "Fingerprinting protection",
      "weight": 2,
      "answer": "partial",
      "evidence": "https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting",
      "note": "Known fingerprinters are blocked by default, but fingerprinting data is only altered in private windows or Strict mode."
    },
    "no_google_services": {
      "title": "No calls to big-tech services",
      "weight": 2,
      "answer": "partial",
      "evidence": "https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work",
      "note": "Google Safe Browsing lists are downloaded by default. The feature can be turned off."
    },
    "security_updates": {
      "title": "Timely security updates",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://www.mozilla.org/en-US/security/advisories/",
      "note": "Mozilla publishes security fixes with each release, and Firefox installs updates automatically."
    }
  },
  "tests": {
    "ssllabs": null,
    "observatory": null,
    "internetnl_web": null,
    "internetnl_mail": null,
    "trackers": [
      {
        "name": "Google Tag Manager",
        "host": "inline code",
        "effect": "no"
      }
    ],
    "tested_at": "2026-10-01T07:01:57.625Z"
  },
  "last_modified": "2026-10-01T07:44:20Z"
}