# Sources and open points

> Every page this anti-tracking guide relies on, when each was opened, and the open questions, such as Mozilla's odd screen-height figure. Updated 26 Oct 2026.

- Canonical URL: https://antitrackingsoftware.com/sources/
- Checked: 2026-10-21

## Pages added in the 26 October update

- [W3C, Mitigating Browser Fingerprinting in Web Specifications](https://www.w3.org/TR/fingerprinting-guidance/): passive and active fingerprinting, mitigations. Group Note of 25 September 2025.
- [Tor Project, Fingerprinting protections](https://support.torproject.org/tor-browser/features/fingerprinting-protections/): letterboxing, fewer buckets, fixed platform.
- [ICO, response to Google's policy change on fingerprinting](https://ico.org.uk/about-the-ico/media-centre/news-and-blogs/2024/12/our-response-to-google-s-policy-change-on-fingerprinting): dated 19 December 2024.
- [Google Chrome Help, How private browsing works in Chrome](https://support.google.com/chrome/answer/9845881?hl=en): what Incognito does and does not do.
- [EFF, Choosing the VPN That's Right for You](https://ssd.eff.org/module/choosing-vpn-thats-right-you): what a VPN hides and what it does not.
- [Brave, Global Privacy Control](https://brave.com/web-standards-at-brave/4-global-privacy-control/), [DuckDuckGo, GPC](https://duckduckgo.com/duckduckgo-help-pages/privacy/gpc), [Privacy Badger](https://privacybadger.org/) and [MDN, Navigator.globalPrivacyControl](https://developer.mozilla.org/en-US/docs/Web/API/Navigator/globalPrivacyControl): how each browser or extension sends GPC and how a page reads it.

## The original reading list, 21 October 2026

- [EFF Surveillance Self-Defense, What Is Fingerprinting?](https://ssd.eff.org/module/what-fingerprinting): what fingerprinting is, details used, how to reduce it. Last reviewed 27 August 2024 on the page.
- [Mozilla Support, Firefox's protection against fingerprinting](https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting): Known and Suspected Fingerprinters, defaults, limits.
- [Mozilla Support, Global Privacy Control](https://support.mozilla.org/en-US/kb/global-privacy-control): what GPC is, how to turn it on in Firefox, limits.
- [Global Privacy Control](https://globalprivacycontrol.org/): the specification project, supporting browsers.
- [Mozilla Firefox Source Docs, Query Parameter Stripping](https://firefox-source-docs.mozilla.org/toolkit/components/antitracking/anti-tracking/query-stripping/index.html): how it works, the initial parameter list.
- [WebKit, Private Browsing 2.0](https://webkit.org/blog/15697/private-browsing-2-0/): Safari Private Browsing protections. Dated 16 July 2024.
- [Brave, Fingerprinting defenses 2.0](https://brave.com/privacy-updates/4-fingerprinting-defenses-2.0/): farbling. Dated 18 May 2020.
- [Google, Next steps for Privacy Sandbox and tracking protections in Chrome](https://privacysandbox.google.com/blog/privacy-sandbox-next-steps): dated 22 April 2025. And [Update on plans for Privacy Sandbox technologies](https://privacysandbox.google.com/blog/update-on-plans-for-privacy-sandbox-technologies): dated 17 October 2025.
- [SecurityWeek, Google will keep third-party cookies in Chrome](https://www.securityweek.com/google-will-keep-third-party-cookies-in-chrome/amp/): news report dated 23 July 2024, not a Google page.
- [Microsoft Support, Tracking prevention in Microsoft Edge](https://support.microsoft.com/en-us/edge/learn-about-tracking-prevention-in-microsoft-edge): Basic, Balanced, Strict. Updated 14 September 2026.
- [EDPB, Guidelines 2/2023 on Technical Scope of Art. 5(3) ePrivacy Directive](https://www.edpb.europa.eu/system/files/documents/2024-10/edpb_guidelines_202302_technical_scope_art_53_eprivacydirective_v2_en_0.pdf): version 2.0, 7 October 2024.
- [California Privacy Protection Agency, joint privacy sweep](https://cppa.ca.gov/announcements/2025/20250909.html): 9 September 2025.
- [EFF, Cover Your Tracks](https://coveryourtracks.eff.org/): the EFF's test of how trackers may view your browser. We link to it but did not run it for any result here.

## Open points
1. **Screen-height figure.** The Mozilla page gives a number for the fixed subtraction on screen height that looks like a possible error, so we do not state it.
2. **Other browsers.** Chrome after October 2025, Brave after 2020 and ordinary (non-private) Safari were not checked. We tested no browser ourselves.
3. **Link cleaner.** The Mozilla list is only the initial one; `utm_`, `gclid` and `msclkid` are our own additions.
4. **Law.** National laws that apply the ePrivacy Directive, EU Digital Omnibus changes and the result of the 2025 CPPA sweep were not read.
5. **Versions.** Browser features change; the version numbers come from the pages above.
6. **Browser check.** It reads the details your browser offers and shows them. It does not measure how unique your browser is.
7. **Review status.** Written from the sources only; no privacy specialist has reviewed it.

If a browser maker or regulator has since settled one of these questions, tell us through the [Contact](https://antitrackingsoftware.com/contact/) page and we will update the page.

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Anti-Tracking Guide · Contact: contact@antitrackingsoftware.com