a11y.css accessibility checker

Name: a11y.css accessibility checker
Rating: 5 (1 reviews)
Author: Stephane Deschamps

a11y.css provides warnings about possible risks and mistakes that exist in HTML code through a style sheet. This extension also provides several accessibility-related utilities. see https://github.com/ffoodd/a11y.css/tree/webextension for details

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Features & Capabilities

a11y.css accessibility checker is a Chrome extension designed to help developers identify potential accessibility issues in HTML code by injecting a specialized CSS stylesheet. It highlights possible risks and common mistakes directly on web pages, enabling a quick assessment of a site's accessibility quality.

Beyond its core warning functionalities, the extension includes useful utilities such as outlining keyboard navigation focus, displaying detected languages based on lang attributes, and checking alt and title attributes on images. This makes it an essential tool for improving web accessibility and ensuring inclusive design.

Originally a bookmarklet by Gaël Poupard, the extension was developed by Stéphane Deschamps with contributions from accessibility experts. It's open for community feedback and bug reports on GitHub.

User Growth & Download Statistics

Add-on Accessibility Developer Tools

By:

Daily users:

Rating:

Version:

2.1.0 Last updated: 2024-12-10

Version code:

5858876

Creation date:

2018-01-18

Risk:

Permissions:

Content scripts matches:

Size:

678.60KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 8,239 ▼ 92

Other rankings

#71 in visibility keyword 23 #113 in free access keyword 54

Other platforms

a11y.css (v2.1.0)

2,000 3.33

(3)

For Developers

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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:

Stephane Deschamps

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/a11ycss/

Website:

https://ffoodd.github.io/a11y.css

Permission Change History

2023-07-01: Version 1.3.0 → 2.0.0

Add Permissions: scripting

2022-09-01: Version 1.2.1 → 1.3.0

Add Permissions: tabs

User Reviews

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by Ga*****, 2022-12-22

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Is a11y.css accessibility checker 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.

a11y.css accessibility checker 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.
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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.

a11y.css accessibility checker has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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