nuMatrix Firefox

nuMatrix

By: arek
Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc. Based on uMatrix by Raymond Hill

Features & Capabilities

nuMatrix is a fork of uMatrix by Raymond Hill (https://github.com/gorhill/uMatrix).

The priority right now is fixing existing issues and adding some much needed features.

Source: https://codeberg.org/arek/nuMatrix Issues: https://codeberg.org/arek/nuMatrix/issues Change log: https://codeberg.org/arek/nuMatrix/releases

The plan?

Not sure. Currently I'm adding little features here and there while I get comfortable with the code base.

Some things that have been added:

  • Keyboard navigation
  • Font column in the matrix
  • 'Temporarily Allow' button when visiting a blocked URL
  • Added new default blocklists
  • Handling beacons as part of hyperlink auditing
  • Display ambigious punycode URLs as ASCII
  • Fixed a few bugs here and there

Original uMatrix description below.


uMatrix: A point-and-click matrix-based firewall, with many privacy-enhancing tools.

For advanced users.

uMatrix put you in full control of where your browser is allowed to connect, what type of data it is allowed to download, and what it is allowed to execute. Nobody else decides for you: You choose. You are in full control of your privacy.

Out of the box, uMatrix works in relax block-all/allow-exceptionally mode, meaning web sites which require 3rd-party scripts are likely to be "broken". With two clicks, uMatrix can be set to work in allow-all/block-exceptionally mode, which generally will not break web sites. See https://github.com/gorhill/httpswitchboard/wiki/How-to-use-HTTP-Switchboard:-Two-opposing-views for more details on this topic.

  • See ALL the remote connections, failed or attempted, depending on whether they were blocked or allowed (you decide).

  • A single-click to whitelist/blacklist one or multiple classes of requests according to the destination and type of data (a blocked request will NEVER leave your browser).

  • Efficient blacklisting: cookies won't leave your browser, JavaScript won't execute, plugins won't play, tracking pixels won't download, etc.

  • You do not have to solely rely on just one particular curated blacklist (arguably with many missing entries) outside which nothing else can be blocked: You are in full control.

  • Ease of use: uMatrix lets you easily whitelist/blacklist net requests which originate from within a web page according to a point-and-click matrix:

  • domain names (left column)
  • from very specific
  • to very generic
  • type of requests (top row)
  • cookies
  • CSS-related resources (stylesheets and web fonts)
  • images
  • plugins
  • scripts
  • XHR (requests made by scripts)
  • frames
  • others

You can blacklist/whitelist a single cell, an entire row, a group of rows, an entire column, or the whole matrix with just one click.

uMatrix's filtering engine uses precedence logic to evaluate what is blocked/allowed according to which cells are blacklisted/whitelisted. For example, this allows you to whitelist a whole page with one click, without having to repeatedly whitelist whatever new data appear on the page.

All rules are scoped. For example, you can block <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/3b0aa1a488ff9809554e48743a9b592944d358a0ffa3f88e394cd3ddfc36894b/http%3A//facebook.com" rel="nofollow">facebook.com</a> and <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/b52b14723bcb9b57d1525192aff019a5c6d90ffc17b120d1740f9c315c789fac/http%3A//facebook.net" rel="nofollow">facebook.net</a> everywhere except when visiting a page on <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/be46a85db88a64d4f9b2373709c52e62d7daea8865244ab5ec08dd004cf723c7/http%3A//www.facebook.com" rel="nofollow">www.facebook.com</a>. This way Facebook won't be able to build a profile of your browsing habits.

The goal of this extension is to make the allowing or blocking of web sites, wholly or partly, as straightforward as possible, so as to encourage users to care about their privacy.

The extension comes with 3rd-party hosts files totaling over 62,000 distinct hostnames (lists can be selectively disabled/enabled according to your choice).

Ultimately, you can choose however you browse the net:

  • Blacklist all by default, and whitelist as needed (default mode).

  • Whitelist all by default, and blacklist as needed.

Either way, you still benefit from the preset blacklists so that at least you get basic protection from trackers, malware sites, etc. Or you can disable all of these preset blacklists.

Your choice.

Randomly assembled documentation: https://github.com/gorhill/uMatrix/wiki

=====

This extension is also useful to understand what the web page in your browser is doing, often without your knowledge. You have full ability to see and decide with whom a web page communicates, and to restrict these communications to specific classes of objects within the web page.

The number which appear in the extension icon correspond to the total number of distinct requests attempted (successfully or not depending on whether these were allowed or blocked) by the web page.

Simply click on the appropriate entry in the matrix in order to white-, black- or graylist a component. Graylisting means the blocked or allowed status will be inherited from another cell with higher precedence in the matrix.

Red square = effectively blacklisted, i.e. requests are prevented from reaching their intended destination:

  • Dark red square: the domain name and/or type of request is specifically blacklisted.
  • Faded red square: the blacklist status is inherited because the entry is graylisted.

Green square = effectively whitelisted, i.e. requests are allowed to reach their intended destination:

  • Dark green square: the domain name and/or type of request is specifically whitelisted.
  • Faded green square: the whitelist status is inherited because the entry is graylisted.

The top-left cell in the matrix, the "all" cell, represents the default global setting, which allows you to choose whether allowing or blocking everything is the default behavior. Some prefer to allow everything while blocking exceptionally. My personal preference is of course the reverse, blocking everything and allowing exceptionally.

This extension is also useful if you wish to speed up your browsing, by globally blocking all requests for images as an example.

=====

BUGS, ISSUES: https://github.com/gorhill/uMatrix/issues

SOURCE CODE: https://github.com/gorhill/uMatrix (GPLv3)

CHANGE LOG: https://github.com/gorhill/uMatrix/releases

User Growth & Download Statistics

Manifest V2 Add-on
By:
arek
Daily users:
44 3
Rating:
5.00
(20)
1 new ratings
Version:
0.0.0.8 Last updated: 2026-04-02
Version code:
6174867
Creation date:
2023-11-09
Risk:
Very high risk impact Moderate risk likelihood
Permissions:
Content scripts matches:
  • *
Size:
9.29MB
URLs:
Website
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-06-19
Compare stats and ranking:

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:
arek
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/numatrix/
Website:
https://codeberg.org/arek/nuMatrix

User Reviews

I love the interface.
by Le*****, 2026-06-17

比那个傻X noscript 好用多了
by 光格*****, 2026-06-07

So much better, the granular control is nice, and the ability to easily import your old uBlock rules saves SO MUCH TIME.
by Ro*****, 2026-04-06
View all user reviews ›

Is nuMatrix 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.

nuMatrix 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.
  • Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
  • High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
  • High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****
  • High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
  • High *** ****** ******* ********* ***** ** ******** *** ********** **** ********
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.

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

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Medium **** ********* *** ******* ** *** **** * ******* *** ******* *** *** ** ****** ** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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