I just installed it with the zip package.
I ran it, closed it and copied the contents of my mozilla xxxxxxx.default folders to the new Moonchild Productions folders.
Looks pretty much exactly the same as FF but with less trash, like temetery, crash reporting, health reporting and social crap.
All my custom themes, bookmarks, extensions and layout are mirrored the same.
PS the custom Address/Progress bar is sweet!!