Thanks for the compliment! Yes, all of the source code is available and can be validated. See our FAQ for details:

https://polybrowser.com/faqs/where-can-i-download-the-source...

Note that we will be opening up our licensing to the community soon, as well as thoroughly documenting the code and posting it to GitHub. We're looking to build a solid community so that the project can continue to grow. Stay tuned!