It&#x27;s a Mozilla Foundation open source project, hosted on github, so it&#x27;s probably more worth looking at <a href="https:&#x2F;&#x2F;github.com&#x2F;mozilla&#x2F;thimble.webmaker.org" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;mozilla&#x2F;thimble.webmaker.org</a>