uMatrix

Name: uMatrix
Rating: 4.7898 (761 reviews)
Author: Raymond Hill

Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.

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Features & Capabilities

uMatrix is an advanced matrix-based browser firewall designed for users seeking full control over web requests. It lets you selectively block or allow different classes of requests such as scripts, iframes, cookies, ads, and tracking pixels on a per-domain basis with simple point-and-click controls.

This powerful extension enhances privacy by preventing unwanted data downloads, tracking, and execution without relying solely on curated blacklists. Its intuitive matrix interface displays domain names against request types, allowing you to whitelist or blacklist entire rows, columns, or specific cells efficiently. Users can operate in either "block all by default" or "allow all by default" modes according to their preferences.

With uMatrix, you gain complete visibility and management over what your browser loads and executes, speeding up browsing, improving privacy, and safeguarding against tracker profiling. It is ideal for advanced users who want granular request control while browsing the web.

User Growth & Download Statistics

Add-on Privacy & Security Developer Tools

By:

Daily users:

Rating:

Version:

1.4.4 Last updated: 2021-07-20

Version code:

5268348

Creation date:

2015-05-12

Risk:

Permissions:

Content scripts matches:

Size:

1.39MB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-19

Compare stats and ranking:

Ranking

# 601 ▲ 4

Other rankings

#139 in Privacy & Security ▲ 1

#43 in iframe keyword 6 ▲ 1

#57 in math keyword 40

#72 in class keyword 5 ▼ 3

#74 in point keyword 32 ▲ 5

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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:

Raymond Hill

Firefox Add-ons Store

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

Website:

https://discourse.mozilla-community.org/t/support-umatrix/5131

User Reviews

uMatrix is a powerful, user-driven blocker with granular control and good integration with uBlock Origin. It’s praised for design and effectiveness in blocking ads, trackers, and scripts. However, development seems slowed or paused, with calls for resurrection. Common downsides include resetting per-page allowances, unreliable persistence, CPU usage after updates, and the absence of a dark mode. Despite stability and maintenance concerns, it remains a highly capable privacy tool for those who want precise control over website behavior.

Pros

Powerful, granular blocking that removes ads, trackers, and unnecessary scripts.
Fine-grained per-site control over what to block or allow.
Strong synergy with uBlock Origin, enhancing overall site privacy.
Brilliant design and usability that makes complex blocking manageable.
Still highly useful even if development has slowed or paused.

Cons

Development appears halted or abandoned; many users hope for resurrection.
Resets approved requests on pages and doesn't reliably save per-page allowances.
Recent updates can cause high CPU usage, impacting performance.
No built-in night mode/dark theme; users want a dark UI.
Some users experience site breakage or instability due to blocking decisions.

Recent reviews

by Me*****, 2026-05-20

A black interface would look pretty nice. :)

by Fi*****, 2026-05-17

I've been using uMatrix for many years.

by co*****, 2026-04-23

View all user reviews ›

Is uMatrix 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.

uMatrix 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.

uMatrix 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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