New Firefox Protections Halve the Number of Trackable Users

New Firefox Protections Halve the Number of Trackable Users reports that Mozilla has rolled out enhanced fingerprinting protections in Firefox 145, building on years of anti-tracking work to make user identification harder even when cookies are blocked or private browsing is used. The changes focus on fingerprinters not included in the list of known trackers and curb access to hardware details such as certain system settings and display information.

Our research shows these improvements cut the percentage of users seen as unique by almost half, according to Mozilla. Firefox’s layered defenses aim to preserve web usability, avoiding features that would break legitimate site functionality, while still blocking invasive fingerprinting vectors. Private mode and the ETP strict mode users are among those benefiting from these protections, which operate without extra extensions or configurations.

The article, published on 11 November 2025, notes that the effort continues Mozilla’s long-running initiative to reduce fingerprintability across the browser ecosystem.