CSP Lab

by Wes Bustraan · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Develop Content Security Policies (CSP) for your website

Users

−3 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#89K

#74K among extensions

Version

0.1

updated 25 Nov 2024

Users

monthly, 2 years

Latest, 16 Oct 2026: 86 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 years

Latest, 16 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About CSP Lab

CSP Lab is designed to help you develop a Content Security Policy for your website. It appears as a tab in the DevTools and it has three modes: 1. In "Existing" mode, it will evaluate the Content Security Policies on the sites that you visit 2. In "Suggest" mode, it will add replace any existing CSP header with a Report-Only header designed to send reports to a service that you run locally. This service will provide you with a CSP that will cover all the reported violations. This mode makes it easy to generate a starter CSP for a website that has never had one before. 3. In "Override" mode, you can specify a CSP that will add a CSP to a site that has none, or replace the one that is there. This mode is designed for testing and tweaking your CSP before you actually deploy it to your site.