Chrome 148 makes Math.tanh a tool for identifying users' operating systems

Starting with Chromium 148, the JavaScript function Math.tanh produces subtly different floating-point results depending on the underlying operating system. This variation arises from differences in how each OS implements low-level math libraries. As a result, websites and trackers can exploit this inconsistency to fingerprint users and infer which OS they are running. The issue highlights how even standard browser math operations can become unintended vectors for user identification. Security researchers have flagged this as a privacy concern for Chromium-based browser users.