# CSS Validation Checker

> The CSS Validation Checker addon for Firefox is a powerful tool for web developers and designers. It seamlessly integrates into the browser, allowing users to quickly validate their CSS code against the latest standards set by the W3C.

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

## Overview

- **ID:** `css-validation-checker`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Lô đề online
- **Category:** web-development
- **Daily users:** 7
- **Version:** 1.0
- **Last updated:** 2024-03-30
- **First published:** 2024-03-29
- **Size:** 8.17 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/css-validation-checker/)

## Rankings

- #38,854 — Overall
- #79 — variation

## Permissions and access

### Permissions

- `tabs`
- `webNavigation`

## Safety

- **Risk impact:** Moderate 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 low 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).

## Similar extensions and apps

- [CSS Lint Checker](https://chrome-stats.com/d/css-lint-checker)
- [Validate HTML](https://chrome-stats.com/d/validate-html-addon)
- [Accessibility Validator](https://chrome-stats.com/d/accessibility-validator) — 1 users
- [Color Contrast Checker](https://chrome-stats.com/d/color-contrast-checker-addon) — 24 users, 1.00 / 5
- [Validate Local CSS Records](https://chrome-stats.com/d/validate-local-css-records)
- [HTML Validator Plus](https://chrome-stats.com/d/html-validator-plus) — 13 users
- [Accessibility Checker Simple](https://chrome-stats.com/d/accessibility-checker-simple) — 1 users
- [Html Validator](https://chrome-stats.com/d/html-validator) — 5,962 users, 4.23 / 5
- [Checkbox Checker](https://chrome-stats.com/d/checkbox-checker) — 16 users
- [Accessibility Checker](https://chrome-stats.com/d/accessibility-checker-sp) — 1 users
- [Style Info](https://chrome-stats.com/d/style-info) — 5 users
- [CSS and XPath checker](https://chrome-stats.com/d/cxchecker) — 134 users, 5.00 / 5

---

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