Mozilla is rolling out improved anti-fingerprinting measures in Firefox 145, initially available in Private Browsing Mode and Enhanced Tracking Protection Strict mode. These updates aim to reduce the number of users who can be uniquely tracked online, now down to 20% by blocking various identifiers while balancing usability for legitimate sites.

This article details the various types of data that web browsers automatically share, including fingerprint IDs, device information, and browser capabilities. It highlights specific features such as CSS support, device memory, and input methods. The goal is to provide insight into how much information is exposed by default to websites.