JShelter

Name: JShelter
Rating: 4.5 (48 reviews)
Author: Libor Polčák

JShelter controls the APIs provided by the browser. The goal is to improve the privacy and security of the user running the extension.

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Features & Capabilities

JShelter is a powerful browser extension designed to enhance your online privacy and security by controlling the APIs accessible via JavaScript. Web pages often use JavaScript to gather detailed information about your browser and device, enabling tracking and fingerprinting. JShelter acts as a firewall for your browser's APIs, allowing you to restrict or modify the data that websites can access.

With JShelter, you can choose to block or limit specific actions, such as reducing geolocation precision or denying access to certain hardware data, effectively shielding you from malicious tracking and attacks on your browser or device. This extension empowers users to regain control over their browsing experience by customizing privacy settings per website. For detailed information, see their FAQ, blog, and threat model.

User Growth & Download Statistics

Add-on Privacy & Security

By:

Daily users:

Rating:

Version:

0.23.1 Last updated: 2026-06-09

Version code:

6298690

Creation date:

2019-02-27

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

471.46KB

Email:

js*****@gnu.org

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-24

Compare stats and ranking:

Ranking

# 5,538 ▲ 150

Other rankings

#39 in goal keyword 4 ▲ 1#135 in improve keyword 34 #176 in provide keyword 33 ▲ 4#210 in javascript keyword 45 ▲ 2#240 in target keyword 7 ▲ 9

Other platforms

JShelter (v0.23.1)

10,000 4.50

(34)

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:

Libor Polčák

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/javascript-restrictor/

Email:

js*****@gnu.org

Website:

https://jshelter.org/

User Reviews

Pros

Comprehensive fingerprint protection
Works against Creepjs fingerprinter
Provides extra protection when JavaScript is enabled
First tool to effectively eliminate cross-site tracking

Cons

High CPU and memory usage
Causes issues with many websites, especially those using CAPTCHA
Some sites are blocked or display messages like 'This Browser Is Out of Date'
Notifications can be overwhelming and become noise

Recent reviews

I really appreciate what this extension does behind the scenes i salute 🫡 the developer n will get behind the program.

by Bi*****, 2026-06-13

The only extension that really safely alters your fingerprint on Firefox. Highly recommended as an addition to your adblocker and strict tracking protection in Firefox

by It*****, 2026-04-12

by Ry*****, 2025-12-24

View all user reviews ›

Is JShelter 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.

JShelter requires a lot of sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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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.

JShelter is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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