JavaScript Permission Matrix

Name: JavaScript Permission Matrix
Rating: 3.6667 (3 reviews)
Author: Anon

By: Anon

This extension allows you to control JavaScript API permissions at per-script basis.

This add-on was removed from Firefox Add-ons Store on 2026-06-18

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Features & Capabilities

This addon allows you to control JavaScript API permissions at per-script basis. You may use it to protect your privacy against fingerprinting. Use options page to specify JavaScript API restrictions. Choose feature name, context (first-party or third-party) and permission level.

TL:DR; this addon may do the same things as WebAPI Manager or Web API blocker, but at per-script basis.

User Growth & Download Statistics

Add-on

By:

Anon

Daily users:

Rating:

3.67

(3)

Version:

1.8.3.6 Last updated: 2026-02-28

Version code:

6165023

Creation date:

2019-09-17

Risk:

Permissions:

Size:

70.50KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-18

Compare stats and ranking:

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:

Anon

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/js-restrictions/

User Reviews

Barely usable. Why do I need to shuffle manually though all categories of scripts to allow youtube load? this is ridiculous. Normal extensions like uMatrix or nuMatrix at least show what requests are blocked and it is easy to fix sites and apply whitelist rules. This may be a cool extension for web developer geeks or paranoid maniacs who has many hours every day to fix sites with this not convenient GUI, but not for regular people.

by Se*****, 2024-11-23

Excellent addition! I am recommended!

by ar*****, 2021-07-23

View all user reviews ›

Is JavaScript Permission Matrix 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.

JavaScript Permission Matrix 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.

JavaScript Permission Matrix may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.