# CSP Tester

> This extension helps web masters to test web application behaviour with Content Security Policy version 2.0 implemented.

Canonical page: [https://chrome-stats.com/d/csp-tester](https://chrome-stats.com/d/csp-tester)

## Overview

- **ID:** `csp-tester`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** oxdef
- **Category:** web-development
- **Daily users:** 74
- **Weekly downloads:** 1
- **Version:** 2.2resigned1
- **Last updated:** 2024-04-25
- **First published:** 2017-06-08
- **Size:** 22 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/csp-tester/)
- **Website:** [https://oxdef.info/csp-tester](https://oxdef.info/csp-tester)

## Description

CSP Tester is a powerful Chrome extension designed to help webmasters and developers test the behaviour of their web applications against Content Security Policy (CSP) version 2.0. By simulating CSP rules, this tool enables you to identify potential security issues and ensure your web app is hardened against XSS and other code injection attacks. Easily validate your CSP implementation to improve your site's security posture and enhance user trust.

## Rankings

- #13,399 — Overall
- #111 — policy

## Permissions and access

### Permissions

- `webRequest`
- `webRequestBlocking`
- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate 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 website URL may be invalid

> 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/csp-tester)