Font Fingerprint Defender

Name: Font Fingerprint Defender
Rating: 4.3438 (32 reviews)
Author: ilGur

Defending against Font fingerprinting by reporting a fake value.

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Font Fingerprint Defender is a lightweight Chrome extension designed to protect your online privacy by obfuscating your font fingerprint. Instead of blocking fingerprinting, it reports randomized fake font values that change with each website visit or page reload, making it harder for trackers to profile you based on your font data. The extension is straightforward to use, requiring no settings or configurations — just install and browse safely. For enhanced privacy, try it alongside related tools that defend against Canvas, AudioContext, and WebGL fingerprinting. To verify its effectiveness, visit sites that reveal font fingerprints and observe the randomized values upon each page refresh. This extension is ideal for users who value privacy but want minimal setup and seamless protection.

Add-on Privacy & Security Utilities

By:

ilGur

Daily users:

1,685 -12

Rating:

4.34

(32)

Version:

0.1.4 Last updated: 2022-11-10

Version code:

5484015

Creation date:

2019-08-25

Risk:

Permissions:

storage
contextMenus
notifications

Size:

42.06KB

Email:

il*****@yandex.com

URLs:

Website

Full description:

Source:

Firefox Browser Add-ons

Updated:

a day ago

Ranking

# 2,263

Other rankings

#205 in Tabs ▲ 1

#363 in Appearance ▲ 1

#7 in font keyword 59

#14 in value keyword 17

#22 in define keyword 3

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Other platforms

Font Fingerprint Defender (v0.1.6)

2,733 5.00

(3)

User reviews

Font Fingerprint Defender is praised for effectively randomizing font fingerprints every page load, enhancing browsing privacy without noticeable interference. It is verified on multiple fingerprint testing sites and works well with other privacy tools. However, some users report that it breaks functionality on certain websites after Firefox updates and does not fully conceal the usage of the extension itself from trackers. Users also desire features like persistent domain-specific fingerprinting. Overall, it is a useful tool with some minor compatibility and detection limitations.

Pros

Effectively randomizes font fingerprint on each page load, making browser identification difficult.
Completely unobtrusive and does precisely what it claims without affecting the browsing experience significantly.
Successfully reduces browser fingerprinting as verified by tests on reputable fingerprint checking sites.
Developer has good motivation to improve privacy through this extension.
Helpful in combination with other privacy tools like Canvas Blocker.

Cons

Causes breakage or malfunction on some websites, notably after Firefox updates.
Does not prevent detection of extension use itself by tracking companies, which might increase fingerprint uniqueness.
Lacks options for persistent font fingerprint generators per domain, which some users desire for better integration with other tools.
Can cause issues with specific web applications, e.g., breaking menus on Jellyfin's media player.

Recent reviews

Wonderful. Please add an option for persistent generators for each domain. I want to combine it with Canvas Blocker (Expert Mode). Note: I know it sounds crazy.

by Fi*****, 2025-05-23

by 远离*****, 2025-03-26

by 远离*****, 2025-02-13

View all user reviews ›

Extension safety

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Font Fingerprint Defender requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Browser Add-ons, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Font Fingerprint Defender has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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