From Ars Technica

Browser Fingerprinting in 2026: How Advertisers Track You Without Cookies

By Ars Technica

Ars Technica's security team reverse-engineers the latest canvas fingerprinting, WebGL entropy harvesting, and AudioContext timing attacks used to uniquely identify browsers across sessions — even in private mode. We show the raw JavaScript, explain how entropy bits are combined into a stable 128-bit device ID, and test which browsers and extensions (Firefox + uBlock Origin vs. Brave vs. Tor Browser) actually defeat cross-site tracking. Disposable identities — including burner email addresses — are the last line of defense when fingerprints persist.