# axe DevTools® - Web Accessibility Testing

> Add accessibility auditing to the Firefox Developer Tools

Canonical page: [https://chrome-stats.com/d/axe-devtools](https://chrome-stats.com/d/axe-devtools)

## Overview

- **ID:** `axe-devtools`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Deque Systems Inc.
- **Category:** web-development,other
- **Daily users:** 10,032
- **Weekly downloads:** 187
- **Rating:** 4.17 / 5 (54 ratings)
- **Version:** 4.117.1
- **Last updated:** 2025-11-13
- **First published:** 2015-08-23
- **Size:** 2.53 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/axe-devtools/)
- **Website:** [https://deque.com/axe](https://deque.com/axe)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/axe-devtools/privacy/](https://addons.mozilla.org/firefox/addon/axe-devtools/privacy/)

## Description

**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.

## Rankings

- #771 — Overall
- #71 — Web Development
- #105 — Other extensions
- #3 — testing
- #8 — visibility
- #11 — free access

## Permissions and access

### Permissions

- `tabs`
- `storage`
- `activeTab`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has medium user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

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.

## Similar extensions and apps

- [axe DevTools - Web Testing](https://chrome-stats.com/d/axe-devtools-web-testing) — 32 users
- [Accesserty DevCheck](https://chrome-stats.com/d/accesserty-devcheck) — 1 users
- [DockWCAG Accessibility Checker](https://chrome-stats.com/d/dockwcag-accessibility-checker) — 3 users, 5.00 / 5
- [AccessCheck Extension](https://chrome-stats.com/d/accesscheck-extension)
- [CheckFox • Accessibility Companion](https://chrome-stats.com/d/checkfox-accessibility) — 1 users
- [A11yInspect Accessibility Testing Tool](https://chrome-stats.com/d/a11yinspect) — 48 users, 5.00 / 5
- [Accessibility Validator](https://chrome-stats.com/d/accessibility-validator) — 1 users
- [Accessibility Checker Pro](https://chrome-stats.com/d/accessibility-checker-pro) — 2 users
- [Aceit Toolbar](https://chrome-stats.com/d/aceit-toolbar) — 7 users
- [Totally Automated Accessibility Scanner](https://chrome-stats.com/d/totally-automated-a11y-scanner) — 79 users, 5.00 / 5
- [Accessibility Insights for Web](https://chrome-stats.com/d/accessibility-insights-for-web) — 75 users, 1.00 / 5
- [Siteimprove Accessibility Checker](https://chrome-stats.com/d/si-accessibility-checker) — 1,694 users, 3.40 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/axe-devtools)