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Website evidence · pilot dataset

Does mozilla.org fingerprint you?

Browser signals observed; fingerprinting is unconfirmed.

Browser API activity met a monitored signal threshold in the latest measured scans. The activity alone does not establish a tracking purpose.

Open evidence JSON ↗

All 5 source records are included in the JSON. Scan timestamps and versions are shown as recorded. The tabs show the latest usable homepage measurement for each setup. Later failed attempts remain in the history. Scan scope and methodology ↗

Inside the scan

← All websites

Visitor setup

Signals observed

1 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Page document
Scan time
2026-10-22T15:10:17.416275Z
Browser / scanner
156.0.8078.4 / 0.4

Captured titleMozilla - Internet for people, not profit (US)

CanvasDraws text and reads canvas output.1 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls

Frame: https://www.mozilla.org/en-US/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.3 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.doNotTrack3 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2021
navigator.platform1 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3083
navigator.userAgent13 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12799
  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12912
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2090
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3107
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 4219
Providers, script signatures, and DNS 1 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

  • Google Tag Managerwww.googletagmanager.com
Network and worker observations 51 requests
Captured scripts
10
Instrumented frames
1
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • www.googletagmanager.com
Other recorded API calls 2
  • document.cookie.read11 calls
  • document.cookie.write8 calls
Source record and integrity
Original source
results/headful/mozilla-org-20261022T151017.json
Original file SHA-256
8c2a3c64b3f5460276e8758d310be402832d5921b86d886947d0c12116f225f2

Run ID: headful-8c2a3c64b3f5. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (2)

Visitor setup

Signals observed

1 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Page document
Scan time
2026-10-20T05:55:01.833306Z
Browser / scanner
156.0.8078.4 / 0.3

Captured titleMozilla - Internet for people, not profit (US)

CanvasDraws text and reads canvas output.3 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls
  • https://www.googletagmanager.com/gtag/js
canvas.getContext1 calls

Frame: https://gtm.mozilla.org/_/service_worker/6a60/sw_iframe.html

  • Inline caller recorded
canvas.getContext1 calls

Frame: https://www.mozilla.org/en-US/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.6 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.doNotTrack3 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2021
navigator.language4 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.googletagmanager.com/gtag/js
navigator.platform1 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3083
navigator.userAgent124 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12799
  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12912
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2090
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3107
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 4219
screen.height4 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.googletagmanager.com/gtag/js
screen.width4 calls

Frame: https://www.mozilla.org/en-US/

  • https://www.googletagmanager.com/gtag/js
Providers, script signatures, and DNS 2 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

  • Google Analyticswww.google-analytics.com
  • Google Tag Managerwww.googletagmanager.com
Network and worker observations 60 requests
Captured scripts
13
Instrumented frames
3
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

  • https://gtm.mozilla.org/_/service_worker/6a60/sw.jsThird-party hosts: None recorded

Third-party hosts

  • www.google-analytics.com
  • www.googletagmanager.com
Other recorded API calls 2
  • document.cookie.read40 calls
  • document.cookie.write14 calls
Source record and integrity
Original source
results/headful/mozilla-org-20261020T055501.json
Original file SHA-256
d6311192f77da492377f47ff7d77abaf461d08c3a9c7775aafa03f56c7fd9b7f

Run ID: headful-d6311192f77d. The JSON contains sanitized observations, not the original private scan payload.

Visitor setup

Scanner error

Scanner error

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Scanner error
Page context
Page not measured
Scan time
2026-10-22T15:10:16.894085Z
Browser / scanner
156.0.8078.4 / 0.4
Scanner error — no usable scan result

The scanner crashed while collecting this page. No usable API results were saved for this setup. A fresh scan is needed; this is not a site-blocking verdict.

Source record and integrity
Original source
results/headful/mozilla-org-20261022T151016.json
Original file SHA-256
8f8800f2a350590acd82fa3c0dc191edd6c98ca9fa3db13f438245c52d65fcc4

Run ID: headful-8f8800f2a350. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Signals observed

1 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Page document
Scan time
2026-10-22T18:31:10.915609Z
Browser / scanner
156.0.8078.4 / 0.4

Captured titleInternet for people, not profit — Mozilla Global

CanvasDraws text and reads canvas output.3 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls
  • https://www.googletagmanager.com/gtag/js
canvas.getContext1 calls

Frame: https://gtm.mozilla.org/_/service_worker/6al0/sw_iframe.html

  • Inline caller recorded
canvas.getContext1 calls

Frame: https://www.mozilla.org/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.6 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.doNotTrack3 calls

Frame: https://www.mozilla.org/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2021
navigator.language18 calls

Frame: https://www.mozilla.org/

  • https://www.googletagmanager.com/gtag/js
navigator.platform1 calls

Frame: https://www.mozilla.org/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3083
navigator.userAgent191 calls

Frame: https://www.mozilla.org/

  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12799
  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12912
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2090
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3107
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 4219
screen.height18 calls

Frame: https://www.mozilla.org/

  • https://www.googletagmanager.com/gtag/js
screen.width18 calls

Frame: https://www.mozilla.org/

  • https://www.googletagmanager.com/gtag/js
Providers, script signatures, and DNS 2 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

  • Google Analyticswww.google-analytics.com
  • Google Tag Managerwww.googletagmanager.com
Network and worker observations 34 requests
Captured scripts
11
Instrumented frames
3
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

  • https://gtm.mozilla.org/_/service_worker/6al0/sw.jsThird-party hosts: None recorded

Third-party hosts

  • www.google-analytics.com
  • www.googletagmanager.com
Other recorded API calls 2
  • document.cookie.read159 calls
  • document.cookie.write42 calls
Source record and integrity
Original source
results/headless/mozilla-org-20261022T183110.json
Original file SHA-256
a94dfd1452987431afafe744dba2409f31756d0c26d8b66824cb738949007293

Run ID: research-a94dfd145298. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (1)

Research setup

Signals observed

1 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Page document
Scan time
2026-10-20T05:37:53.818569Z
Browser / scanner
156.0.8078.4 / 0.3

Captured titleInternet for people, not profit — Mozilla Global

CanvasDraws text and reads canvas output.3 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls
  • https://www.googletagmanager.com/gtag/js
canvas.getContext1 calls

Frame: https://gtm.mozilla.org/_/service_worker/6a60/sw_iframe.html

  • Inline caller recorded
canvas.getContext1 calls

Frame: https://www.mozilla.org/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.6 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.doNotTrack3 calls

Frame: https://www.mozilla.org/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2021
navigator.language4 calls

Frame: https://www.mozilla.org/

  • https://www.googletagmanager.com/gtag/js
navigator.platform1 calls

Frame: https://www.mozilla.org/

  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3083
navigator.userAgent121 calls

Frame: https://www.mozilla.org/

  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12799
  • https://www.mozilla.org/media/js/lib.57070d33021c.jsline 2 · col 12912
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 2090
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 3107
  • https://www.mozilla.org/media/js/site.c6d6f1fa36a4.jsline 1 · col 4219
screen.height4 calls

Frame: https://www.mozilla.org/

  • https://www.googletagmanager.com/gtag/js
screen.width4 calls

Frame: https://www.mozilla.org/

  • https://www.googletagmanager.com/gtag/js
Providers, script signatures, and DNS 2 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

  • Google Analyticswww.google-analytics.com
  • Google Tag Managerwww.googletagmanager.com
Network and worker observations 31 requests
Captured scripts
11
Instrumented frames
3
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

  • https://gtm.mozilla.org/_/service_worker/6a60/sw.jsThird-party hosts: None recorded

Third-party hosts

  • www.google-analytics.com
  • www.googletagmanager.com
Other recorded API calls 2
  • document.cookie.read40 calls
  • document.cookie.write14 calls
Source record and integrity
Original source
results/headless/mozilla-org-20261020T053753.json
Original file SHA-256
d9600f72b2d8bb3142e13f97ee1fab59cd941ddddd918926743998bd532a2fef

Run ID: research-d9600f72b2d8. The JSON contains sanitized observations, not the original private scan payload.

Queries, request bodies, cookies, extracted values, raw errors, and session payloads are excluded before publication. The source digest identifies the original private record.

Read the sanitized JSON →