xiMatrix

By: xi

block requests based on domain and type

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Install

Features & Capabilities

This extension is heavily inspired by uMatrix, but much simpler. By default, all web requests as well as inline code are blocked. You can then define rules to allow only those requests you want. Definitely for advanced users.

Differences to uMatrix:

advantages
- uMatrix is no longer maintained. The last release was in July 2021.
- keyboard navigation
- simpler code
- rules are encoded as JSON
- it is possible to control inline scripts, styles, and images
- there is a separate column for fonts
disadvantages / simplifications
- no settings at all
- less flexible rules
  - there are no block rules, so it is not possible to overwrite an extensive allow rule with a more specific block rule
  - images and media have been combined into a single column
  - I am sure some of the details of the rule inheritance are different. I tried to produce something that works for me rather than copying every detail.
- the popup is not updated while it is open. You have to close and open it again to refresh the data.
- blocked images are not replaced by a placeholder

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

4.83

(6)

Version:

0.11.2 Last updated: 2026-06-13

Version code:

6304695

Creation date:

2022-07-30

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

16.97KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-19

Compare stats and ranking:

Ranking

# 68,134 ▼ 401

For Developers

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Contact the developer

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Developed by:

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/ximatrix/

Website:

https://github.com/xi/xiMatrix

Permission Change History

2025-04-25: Version 0.9.0 → 0.10.0

Add Host permissions: <all_urls>

Remove Permissions: <all_urls>

User Reviews

by pe*****, 2025-10-08

Honestly, good job. BUT! Whether the developer will see this or not, if you see this, PLEASE implement the counter, so that I would see how much requests xiMatrix have blocked. Additionally, while not required and unrelated, it would be really better if the description of that browser extension on here, would be improved. Like, how much is it better then uMatrix? Why? Is xiMatrix a FORK of uMatrix or ORIGINAL? Does xiMatrix has ALL of the features uMatrix has or what features does it lacks unlike uMatrix?

by im*****, 2025-09-01

I like that this extension is lightweight, super fast and easy to use. There is a bug however. This extension brakes installation of addons from addons.mozilla.org. The site says: extension cannot be installed because of connection problems. I didn't see any indicators of blocked requests in Ximatrix though. Had to disable over 30 firefox extensions to find out have to blame Ximatrix. Took me a lot of time. Please investigate this. Thanks for your great work.

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

View all user reviews ›

Is xiMatrix 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.

xiMatrix 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 ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
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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.

xiMatrix 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.
High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****
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