Is Brave always based on the latest version of Firefox? Or did it branch of at some point in the past?
They've since moved from Muon to Chromium for the browser chrome[3].
[1]: https://github.com/brave/muon/blob/master/README.md [2]: https://github.com/brave/muon/blob/master/docs/tutorial/movi...
[3]: https://brave.com/development-plans-for-upcoming-release/