Font Fingerprint Defender

Defending against Font fingerprinting by reporting a fake value.

Users100K

Rating3.5

Reviews24

Manifest versionV3

7-day growth0

7-day growth rate0%

Preview

Font Fingerprint Defender Media preview

2 assets

Trend

30-day user trend

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User Growth Over Time

Rating trend

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30-day rating change

Start

3.54

Latest

3.54

30-day rating change

0.00

2026年5月29日2026年6月4日

Growth overview

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1-day growthFlat

00%

7-day growthFlat

00%

30-day growthGrowing

+90K+900%

Technical snapshot

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Version0.1.6

ManifestV3

Size40.34KiB

Languages1English

Published--

Store updated--

Last crawled--

Overview

Product summary

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Font Fingerprint Defender is a lite extension that let you easily hide your real font fingerprint by reporting a random fake value and protect your privacy.

This add-on does NOT block the fingerprint, instead, it simply adds a small noise to the actual fingerprint and "renews" it every time you visit a website or reload a page. It is important to note that, this add-on does not have any settings or options to adjust. Simply add it to your browser and start surfacing the internet. If you want to test this add-on, please visit a website that show your fingerprint (i.e. webbrowsertools.com/font-fingerprint/). Every time you reload the page, you will see a new fake fingerprint.

This extension is made in collaboration with the author of "Canvas Fingerprint Defender":

https://chrome.google.com/webstore/detail/canvas-fingerprint-defend/lanfdkkpgfjfdikkncbnojekcppdebfp

Note 1: depending on your browser and platform, you may need to (Shift+Refresh) a web page to renew Font fingerprint.

Note 2: To report bugs, please visit addon's homepage (https://mybrowseraddon.com/font-defender.html) and fill the bug report form.

Reviews

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The Chrome Web Store shows 24 reviews, but only 0 review bodies have synced into ExtScope so far. Showing the synced reviews available right now.

5★

4★

3★

2★

1★

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Review related products from the Chrome Web Store detail page.

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AI product read

Privacy protection against browser font fingerprinting by injecting fake/random noise into font-related DOM measurements

Websites use font fingerprinting (measuring offsetWidth/offsetHeight of elements with specific fonts) to create a unique identifier and track users across sessions. This extension defeats that by adding small random noise to these measurements, generating a different fingerprint each time.

User installs extension → it automatically starts working on all websites (content scripts injected into *://*/*) → when a site attempts font fingerprinting by reading offsetWidth/offsetHeight, the extension intercepts and returns values with random noise → user optionally receives a desktop notification about the detected attempt → user can click popup to test their fingerprint on webbrowsertools.com

Target users: Privacy-conscious web users who want to prevent font-based browser fingerprinting / Users concerned about online tracking without wanting complex configuration

Extension is very small (20 files, ~40KB) with straightforward logic, making comprehensive analysis feasible
The 'explore' section in the popup promotes other extensions by the same developer but all appear to be free tools

Monetization

No paid features detected

No payment system, subscription, feature gating, or upgrade prompts exist. The popup has a voluntary 'donation' button that simply opens the developer's homepage with a '?reason=support' query parameter - this is not a paid feature gate. The 'explore' section promotes other free extensions by the same developer. All 'pro' keyword matches are false positives referring to JavaScript 'prototype' properties, 'stopPropagation()', and other generic programming terms.

Confidence: 95
Payment platform: --
Source: AI / High
Login required: No
Reason: No login, authentication, or account system exists in the extension. It works entirely locally by injecting content scripts that modify HTMLElement.prototype properties. The 'session' keyword at lib/chrome.js:111 ('if (app.session) app.session.load()') is a generic state-management pattern, not authentication. No OAuth flows, credential storage, or account creation found.

Permission risk

Medium-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage

Publisher

Keller

Independent publisher

Email: [email protected]
Phone: --
Address: --

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