Laboratory is an experimental Firefox extension that helps you generate a proper Content Security Policy (CSP) header for your website. Simply start recording, browse your site, and enjoy the CSP header that it produces:

It currently requires at least Firefox 53. This means that it currently works with Firefox Developer Edition and Nightly, and should work with release once it reaches version 53.

It is recommend that developers use web-ext for installation and testing. It provides a number of useful features, such as automated installation and autoreload upon source changes:

$ web-ext run -s src --ignore-files 'img/*.afdesign'

If you are simply looking to give it a single run, you can install it by navigating to:

Firefox -> Tools -> Add-ons -> Extensions -> (Gear Icon) -> Debug Add-ons -> Load Temporary Add-on

Navigate to src/manifest.json and it should start running immediately.