Blocking of known trackers
Does the browser stop requests to known trackers or fingerprinting scripts from loading at all?
Once a domain is classified as a tracker, a browser can either block requests to it, or let the request through but restrict its storage.
- When a request is blocked, nothing reaches the tracker: a script never downloads or runs, and a pixel is never sent.
- When only storage is restricted, the script still runs and can send data, but it can’t keep a cookie or other identifier that would let it recognize the same browser on other sites.
Blocking protects more but breaks more, so most browsers block only the categories they see as clearly harmful, such as cryptominers and fingerprinting scripts, and restrict the storage of everything else. Brave is the exception: it blocks everything on its filter lists that is loaded from another site.
By browser
Brave
Blocked- Third-party requests that match the filter lists are blocked, including ads, trackers, cryptominers and known fingerprinting services. New
- Requests that are same-site with the page are not blocked. New
- Some blocked scripts are replaced with harmless stand-ins so the page keeps working. New
Sources (2) · 2026-10-31
Chrome
No restrictions- Requests to known trackers are not blocked. New
Checked · 2026-10-31
Edge
Limited- Requests to known cryptominers and fingerprinters are blocked, even on sites the user engages with. New
- Fingerprinters that are only on Disconnect.me’s Fingerprinting list, and in no other category, are not blocked. New
- Other known trackers still load, but without storage access. New
Sources (1) · 2026-10-31
Firefox
Limited- Requests to the most common social media trackers (Facebook, Twitter and LinkedIn), cryptominers and known fingerprinters are blocked. New
- Other tracking content, such as ads and embedded videos, still loads, but its cross-site tracking cookies are blocked. New
Sources (1) · 2026-10-31
Safari
Limited- Cross-site requests to identity resolution (“ID graph”) services are blocked. Safari 27+ New
- Navigations and same-site requests to these services are not blocked. Apple maintains the list and doesn’t publish it. Safari 27+ New
- Other known trackers are not blocked. ITP restricts their storage instead.
Sources (2) · 2026-10-30
History
Safari 27 blocks identity resolution services
Cross-site requests to “ID graph” services, which link the same person across sites and devices, are blocked whenever “Prevent cross-site tracking” is on. Apple maintains the list of domains.
Firefox 72 blocks known fingerprinters
Requests to domains in Disconnect.me’s Fingerprinting category, when also listed as trackers, are blocked by default.
Firefox 70 blocks social media trackers
Requests to the most common social media trackers are blocked by default.
Enhanced Tracking Protection on by default
Firefox 69 blocks third-party cookies of known trackers and cryptominers for all users.