# Fingerprint Defender

> Protect against browser fingerprinting with per-session noise (canvas, audio, client-rects) instead of static spoofing. Blocks WebRTC IP leaks. Passes your real GPU, browser, timezone and fonts through so you blend in rather than stand out.

Canonical page: [https://chrome-stats.com/d/fingerprint-defender](https://chrome-stats.com/d/fingerprint-defender)

## Overview

- **ID:** `fingerprint-defender`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Digital Fracture
- **Category:** web-development,privacy-security,appearance
- **Daily users:** 552
- **Weekly downloads:** 78
- **Rating:** 4.33 / 5 (6 ratings)
- **Version:** 2.1.2
- **Last updated:** 2026-06-30
- **First published:** 2025-12-28
- **Size:** 35 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/fingerprint-defender/)
- **Website:** [https://digitalfracture.co.uk](https://digitalfracture.co.uk/)

## Description

<strong>Fingerprint Defender v2.1.2 - Blend in, don't stand out</strong>

A privacy extension that fights browser fingerprinting with <strong>noise randomization</strong> instead of static spoofing.

<strong>Why this approach</strong>

Most fingerprint "spoofers" fake your browser, GPU and screen. The problem: those fake values do not match any real browser, so you become <em>the only person with that exact fake setup</em> - easier to track, not harder. Fingerprint Defender does the opposite: <strong>randomize the things used to track you, and let your real, common values through</strong> so you look like everyone else.

<strong>Noise - breaks cross-site tracking</strong>
<ul><li><strong>Canvas</strong> - randomizes the canvas image pixels.</li><li><strong>Audio</strong> - randomizes the rendered AudioContext output (offline and real-time paths).</li><li><strong>Client Rects</strong> - adds tiny noise to element position and size measurements.</li></ul>
<strong>Block - leak prevention</strong>
<ul><li><strong>WebRTC</strong> - stops WebRTC leaking your local or public IP. Turn off for video calls.</li><li><strong>Battery</strong> - blocks the Battery Status API.</li></ul>
<strong>Spoof - one common value to blend in</strong>
<ul><li><strong>Screen</strong> - reports 1920x1080, the most common resolution.</li></ul>
<strong>Pass-through - real, common values left alone (on purpose)</strong>

Changing these would make you <em>more</em> unique, not less:
<ul><li><strong>WebGL / GPU</strong> - your real GPU; faking it creates impossible combinations.</li><li><strong>Browser / User-Agent</strong> - real, so you blend with other Firefox and Windows users.</li><li><strong>Timezone</strong> - real, so calendars and scheduling work.</li><li><strong>Fonts</strong> - real; the font list is the same on every site, so it cannot link you.</li><li><strong>Plugins</strong> - returned empty to reduce surface.</li></ul>
<strong>Honest limits - what this does NOT do</strong>

No extension makes you invisible:
<ul><li><strong>Cookies and logins</strong> are not touched. Turn on Firefox Enhanced Tracking Protection (Strict).</li><li><strong>Your IP address</strong> is not hidden, apart from the WebRTC leak. Use a VPN or Tor.</li><li><strong>Logged-in sites</strong> know who you are regardless of fingerprinting.</li><li><strong>Static device traits</strong> (sample rate, CPU cores, exact GPU) cannot be safely faked. Some testers build an "audio hash" from these - it will not change, and that is expected. It is the same for many users, so it does not single you out.</li><li><strong>AudioWorklet</strong> audio capture and <strong>canvas text-metrics</strong> are not covered.</li></ul>
<strong>How to test it properly</strong>

Reload a reputable tester a couple of times. The Canvas and Audio hashes should <strong>change each time</strong> - that is it working. WebGL, browser, timezone and fonts staying the same is intentional. The most reliable tester is <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/3427010ed5c39574c34827167da66393c11e040d24ff7dd19b1ba4de3e828dee/https%3A//abrahamjuliot.github.io/creepjs/" rel="nofollow">CreepJS</a>: it does not cache, it shows the Canvas and Audio codes changing on every reload, and it flags the canvas as "rgba noise". Note that <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/ecd7ee540daf52a0b1ff621e6cdf436e64c1d7a74ca28a2e7f62ed9b32ae6ebc/https%3A//browserleaks.com/" rel="nofollow">browserleaks.com</a> <em>caches</em> the canvas value it shows on screen, so it can look unchanged on a normal refresh even when the real canvas is changing every load - open it in a fresh tab, or just use CreepJS. Also good: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/354e7521099e6eb3a173e7b992b74fed5a1ed23eb8ca8820e12fe561b825ea7d/https%3A//coveryourtracks.eff.org/" rel="nofollow">Cover Your Tracks by EFF</a> and <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/ba218f2b60c112cdf4346c97a2f5bd68350bee5d9e75b17431113641f72006c0/https%3A//amiunique.org/fingerprint" rel="nofollow">amiunique.org</a>.

<strong>Privacy</strong>

No data collection. No tracking. No external connections. Everything runs locally in your browser.

Developed by <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/fba8fc756bd6be767b05d4b4e11f61ad0f4ecea827bc43298743141d75b1a99a/https%3A//digitalfracture.co.uk" rel="nofollow">Digital Fracture</a>

## Rankings

- #4,713 — Overall
- #28 — wa sender
- #46 — defi
- #69 — print
- #151 — finder
- #201 — value

## Permissions and access

### Permissions

- `storage`
- `<all_urls>`
- `webRequest`
- `webRequestBlocking`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

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Source: [Chrome-Stats](https://chrome-stats.com/d/fingerprint-defender)