Firefox's new anti-fingerprinting feature

Firefox’s new “Phase 2” anti-fingerprinting feature (introduced in Firefox 145) makes the browser much better at hiding device details that websites use to uniquely identify you. It does this by spoofing or limiting information like the number of CPU cores (always reporting a fixed low value), blocking access to locally installed fonts (only standard system fonts are allowed), reporting generic or limited touch-input support (0, 1, or 5 points), and slightly altering your screen resolution to hide taskbar/dock size. In addition, when a site tries to read canvas images (a common fingerprinting trick), Firefox adds tiny random “noise” to the pixel data so the fingerprint is less consistent. These protections are initially active in Private Browsing and when Enhanced Tracking Protection is set to Strict, and—according to Mozilla—cut down the fraction of users who can be uniquely fingerprinted from ~35% to about ~20% under test conditions.