# Compat Report

> Shows a report of browser compatibility issues using data from MDN

Canonical page: [https://chrome-stats.com/d/compat-report](https://chrome-stats.com/d/compat-report)

## Overview

- **ID:** `compat-report`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Eduardo Bouças
- **Category:** web-development,other
- **Daily users:** 375
- **Weekly downloads:** 4
- **Rating:** 4.64 / 5 (28 ratings)
- **Version:** 0.1.1resigned1
- **Last updated:** 2024-04-25
- **First published:** 2017-12-09
- **Size:** 330 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/compat-report/)

## Description

**Compat Report** is a Chrome extension designed to help developers identify browser compatibility issues quickly and efficiently. Using comprehensive data from MDN (Mozilla Developer Network), it generates detailed reports highlighting features and APIs that may not work consistently across all browsers. This tool streamlines the debugging process, saving time and improving user experience by ensuring web applications are robust and accessible on diverse browsing platforms.

Whether you are a frontend developer, QA tester, or web designer, Compat Report is an essential utility for maintaining compatibility standards. Its seamless integration into the browser environment allows for on-the-fly analysis without disrupting your workflow.

## Rankings

- #5,985 — Overall
- #237 — compare

## Permissions and access

### Permissions

- `<all_urls>`
- `tabs`
- `webNavigation`

## Safety

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

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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).

## Review summary

Users find Compat Report a valuable tool for checking browser compatibility and understanding required polyfills, appreciating its convenient and clear information. However, multiple reviews highlight performance issues like lag and freezing, lack of dark mode support, and interface clunkiness such as full tab reloads when toggling stylesheets. Users also desire filtering features to improve browsing compatibility problems. Overall, while the add-on concept is praised, improvements are needed for smoother and more user-friendly operation.

### Pros

- Provides clear compatibility information for websites across different browsers.
- Helps identify necessary polyfills for modern CSS/JavaScript usage.
- Better and more convenient than manually checking compatibility websites.
- Concept and functionality are appreciated and considered valuable by users.
- Generally works pretty well despite some clunkiness.

### Cons

- Lags and freezes frequently, affecting usability.
- No support for dark mode; interface is white and clashes with dark themes.
- Turning off stylesheets causes entire tab to reload, not just compatibility section, making interaction clunky.
- Lacks filtering options to easily browse compatibility issues.

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