You don't think that us non-Friedens can/will learn something about how to fit more recent Mozilla code into OS4 by viewing this code and comparing with Mozilla baseline from that time period? As Thomas mentioned in his post, build documentation is forthcoming as well.
That is a heck of a task you are proposing without the documentation to tell you what the Brothers did to the original source code.
But we might as well be optimistic.
Good luck to anyone that wants to try it.
BTW - Even a MorphOS user can admit to you that the Friedens are fairly competent, and
they have lost interest in it.