# Siteimprove Accessibility Checker

> Jumpstart your web accessibility efforts directly in Firefox. Is your web page accessible for everyone? Assess the accessibility of your web pages conveniently in Mozilla Firefox browser with the Siteimprove Accessibility Checker.

Canonical page: [https://chrome-stats.com/d/si-accessibility-checker](https://chrome-stats.com/d/si-accessibility-checker)

## Overview

- **ID:** `si-accessibility-checker`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Siteimprove
- **Category:** web-development
- **Daily users:** 1,591
- **Weekly downloads:** 17
- **Rating:** 3.40 / 5 (5 ratings)
- **Version:** 2026.8.10.934
- **Last updated:** 2026-09-09
- **First published:** 2021-05-04
- **Size:** 3.14 MB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/si-accessibility-checker/)
- **Website:** [https://siteimprove.com/en/company/contact/](https://siteimprove.com/en/company/contact/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/si-accessibility-checker/privacy/](https://addons.mozilla.org/firefox/addon/si-accessibility-checker/privacy/)

## Description

Siteimprove Accessibility Checker is a Firefox extension that lets you test any web page for accessibility against ACT rules. It provides instant analysis, a breakdown of issues, and practical recommendations linked to WCAG techniques to help you fix barriers quickly. It also securely evaluates password-protected and dynamic content, making it a practical tool for real-world sites.

By installing this extension you agree to Siteimprove's Terms of Service and Privacy Policy: [Terms of Service](https://siteimprove.com/en/legal/chrome-extension-tos/), [Privacy Policy](https://siteimprove.com/en/legal/).

## Rankings

- #2,510 — Overall
- #280 — Web Development
- #7 — effort
- #9 — process
- #11 — visibility
- #14 — checker

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `unlimitedStorage`
- `scripting`

### Host permissions

- `*://hello.siteimprove.com/*`

## Safety

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

### Analysis details

- Access to developer tools, typically low risk unless it's used to inspect or manipulate data improperly.
- This extension was recently updated in the past month. New updates 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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/si-accessibility-checker)