Silk - Privacy Pass Client

Name: Silk - Privacy Pass Client
Rating: 3.1706 (721 reviews)
Author: Cloudflare Research

By: Cloudflare Research

Client support for Privacy Pass anonymous authorization protocol.

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Features & Capabilities

Silk - Privacy Pass Client is a Chrome extension designed to support the Privacy Pass anonymous authorization protocol. It provides unlinkable cryptographic tokens for websites that implement Privacy Pass, such as those protected by Cloudflare, improving your human signal and reducing friction during verification challenges.

The extension automates the token acquisition process: when a site requests a Privacy Pass token, Silk prompts you to complete the associated challenge. Upon successful completion, the extension securely obtains a token to streamline future access without compromising your privacy. This tool leverages Cloudflare Research's Privacy Pass providers and is ideal for users seeking enhanced privacy and seamless browsing on protected sites. For more details, FAQs, and troubleshooting, refer to the extension's official documentation and support links.

User Growth & Download Statistics

Add-on Privacy & Security Developer Tools

By:

Daily users:

Rating:

Version:

4.0.2 Last updated: 2024-04-04

Version code:

5714566

Creation date:

2017-09-18

Risk:

Permissions:

Size:

98.29KB

Email:

pr*****@cloudflare.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-09

Compare stats and ranking:

Ranking

# 614 ▼ 1

Other rankings

#143 in Privacy & Security ▼ 1

#5 in privacy keyword 54

#6 in data privacy keyword 32

#18 in author keyword 13

#64 in associate keyword 7 ▼ 1

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Other platforms

Silk - Privacy Pass Client (v4.0.2)

300,000 2.29

(725)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Cloudflare Research

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/privacy-pass/

Email:

pr*****@cloudflare.com

Website:

https://github.com/cloudflare/pp-browser-extension/issues

Permission Change History

2024-01-08: Version 3.0.6 → 4.0.0

Add Permissions: storage tabs

Remove Permissions: cookies

User Reviews

Most reviews say Silk is largely non-functional: it frequently triggers Cloudflare captchas, loops, or returns errors without solving the target site's challenge. Several users report conflicts with extensions like uBlock, causing looping behavior or errors. Other reviews mention intrusive behavior of opening new tabs for attester verification and a lack of updates/maintenance (abandonware). Only one review hints at a potential captcha reduction on some sites; overall, the add-on appears unreliable and not worth using.

Pros

Cons

Not working / broken: reports of Cloudflare captchas not solving the target challenge, errors, and endless loops.
Causes additional captchas instead of reducing them.
Conflicts with uBlock/other extensions, triggering loops or errors.
Intrusive behavior: opens new tabs to verify an attester without clear consent.
Abandoned / not maintained: lack of updates and GitHub activity.

Recent reviews

Does not work anymore

by fo*****, 2026-06-26

Completely broken. The cloudflare captcha fails with an error on the freaking pp-attester-turnstile.research.cloudflare.com/challenge page, as well as endless looping on the sites I want to visit.

by Wi*****, 2026-01-21

by Fi*****, 2026-01-18

View all user reviews ›

Is Silk - Privacy Pass Client Safe?

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.

Silk - Privacy Pass Client requires some sensitive permissions that could impact your browser and data security. 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 Add-ons Store, 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.

Silk - Privacy Pass Client has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

Medium This extension has medium user count. Unpopular extensions may not be stable or safe.
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