axe DevTools® - Web Accessibility Testing

Name: axe DevTools® - Web Accessibility Testing
Rating: 4.1667 (54 reviews)
Author: Deque Systems Inc.

By: Deque Systems Inc.

Add accessibility auditing to the Firefox Developer Tools

axe DevTools® - Web Accessibility Testing

Download

Install

Features & Capabilities

axe DevTools® is a powerful accessibility checker designed for developers, testers, and designers using Firefox. Integrated directly into Firefox Developer Tools, it provides fast and reliable accessibility audits driven by the trusted axe-core engine from Deque.

This free browser extension helps identify and fix accessibility issues quickly, ensuring your websites are inclusive for the 1 billion people globally living with disabilities. Its unique zero false-positives approach saves time and effort by only reporting real issues, reducing reworks and preventing recurring accessibility tickets.

axe DevTools streamlines your workflow with automated testing that uncovers nearly triple the industry average of accessibility problems. Each issue includes detailed insights and free remediation guidance to make fixes straightforward. By proactively addressing accessibility early in development, you reduce risks, costs, and improve overall user experience without slowing progress.

This extension respects privacy and does not collect any usage data.

User Growth & Download Statistics

Add-on Developer Tools Accessibility

By:

Daily users:

Rating:

Version:

4.117.1 Last updated: 2025-11-13

Version code:

6072746

Creation date:

2015-08-23

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

2.53MB

Email:

ax*****@deque.com

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 758 ▲ 4

Other rankings

#70 in Web Development ▼ 2

#109 in Other extensions ▲ 1

#3 in testing keyword 46 ▼ 1

#7 in visibility keyword 23

#9 in free access keyword 54

Upgrade to see more rankings

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:

Deque Systems Inc.

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/axe-devtools/

Email:

ax*****@deque.com

Website:

https://deque.com/axe

Permission Change History

2023-01-27: Version 4.36.2 → 4.48.0

Add Permissions: activeTab

2022-08-18: Version 4.33.2 → 4.35.0

Remove Permissions: activeTab

User Reviews

The add-on is praised for being very useful for accessibility testing with easy-to-use, clear reports and a clean UI, making it a go-to tool for developers and QA. However, many reviews report it causing site breakage or crashes on various sites and tools, plus concerns about privacy data collection. Some also note background activity and slow loading as disruptive.

Pros

Very useful tool for accessibility testing; helps developers and QA identify issues quickly and keep up with accessibility requirements.
Clear and actionable reports that show what’s wrong, where, and how to fix.
Easy to use with a simple, clean UI that reduces distractions.

Cons

Causes site breakage/crashes on many websites and dev tools (e.g., Kickstarter white pages, Azure/CircleCI, login portals) and can affect pages even when not active.
Privacy concerns: some reviews allege data collection or selling data, while others claim the extension does not capture analytics, reflecting conflicting messaging about privacy.
Background activity and slow loading: reports of the extension running tasks in the background, or endless 'analyzing your page...' loading on local and various pages.

Recent reviews

can be interestings, but broke some website. Exemple : with free version : kickstarter is broken white page except header.

by sh*****, 2026-03-27

As another user mentioned, while this is typically a good tool, it appears to be doing some things in the background without being asked to, which is crashing some sites. Unable to use the Wise website, for instance. It loads for a moment and then whitescreens.

by Fi*****, 2026-03-24

by Fi*****, 2026-02-05

View all user reviews ›

Is axe DevTools® - Web Accessibility Testing 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.

axe DevTools® - Web Accessibility Testing requires some sensitive permissions that could impact your browser and data security. 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 ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
Medium ****** ** ********* ****** ********* *** **** ****** **** **** ** ******* ** ********** **** ***********

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.

axe DevTools® - Web Accessibility Testing is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

Medium This extension has medium user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******