https://firefox-source-docs.mozilla.org/contributing/directory_structure.html
For information on how to build Firefox from the source code and create the patch see:
https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html
pythia-inc/PRG.Springfield.Mozilla
A (currently) open-source project on a browser intended for Enterprise applications. Will go closed-sourced and paid at some point.
NOASSERTION