What is Poof

Poof is a Fingerprint Spoofer, a Chrome extension (Manifest V3) designed to mask your browser fingerprint and reduce online tracking. Instead of exposing your real browser data (such as user agent, screen resolution, WebGL, and more), websites see a fake but consistent profile. The same fingerprint is used across all tabs until you regenerate it. The goal is to enhance privacy by preventing websites from uniquely identifying your browser.

Features

• Fingerprint spoofing – Overrides key browser properties used for tracking, including navigator.userAgent, platform, language/languages, screen size and color depth, WebGL vendor/renderer, canvas (with noise), AudioContext, timezone, hardwareConcurrency, and deviceMemory.
• Session consistency – A single random fingerprint is generated per session and shared across all tabs until you click “Generate New Fingerprint”.
• Predefined profiles – Choose from Windows Chrome, Mac Chrome, Mac Safari, Windows Firefox, or Random (a mix of characteristics). Each profile defines user agent, platform, resolution, WebGL, and more.
• Toggle on/off – Enable or disable spoofing globally from the popup (except for whitelisted domains).
• Whitelist – Exclude specific domains from spoofing. These sites will use your real fingerprint. You can add domains manually or use the current active tab.
• Fingerprint regeneration – Instantly generate a new consistent profile using the “Generate New Fingerprint” button (applies to refreshed or new tabs).
• Network header modification – Uses Declarative Net Request to modify User-Agent and Client Hints (Sec-CH-UA, Sec-CH-UA-Mobile, Sec-CH-UA-Platform) for HTTP/HTTPS requests, excluding whitelisted domains.
• Early injection – Runs at document_start and injects into the page context (MAIN world) to ensure overrides are applied before site scripts execute.
• Live preview in popup – View current spoofed values (user agent, platform, screen, WebGL, timezone, etc.) directly in the extension popup.
• No external dependencies – Built with pure JavaScript (no npm). All fingerprint generation and logic run locally in the browser.

Release notes

Requirements

Fingerprint Spoofer is designed for modern Chromium-based browsers supporting Manifest V3. It is known to work on:

• Google Chrome
• Microsoft Edge (Chromium)
• Other Chromium-based browsers