It's fork of Palemoon, but not related to PM by any means when it comes to branding as it's browser with a different name. I have direct contact with the developer Thomas and he approves. Worst case I can get a written approval from him.
Name: webbrowser
It's a fork of the independent project Palemoon browser.
Homepage: https://git.nuegia.net/webbrowser.git/
It's a Goanna based browser with absolutely zero unsolicited requests & spyware BY DEFAULT, and absolutely zero non-free branding. And yes it's open source.