At least the search in address bar is configurable. Personally I prefer Chrome's approach but I think that Firefox should make the old separate search bar be the default.
If Firefox wants to position itself as an alternative to Chrome, it should try to be an alternative to Chrome and that means that it would have to be different, it has to be its own thing.
Otherwise Chrome Users will just see it as a copy - an inferior copy - to Chrome and they will go back to the "real thing".
Google chose to unify the search and address bar so as to make word or misspelled URL lead to a Google search. But that is not always what the user intended.
If Mozilla wants to provide a search as a backup, they should put a pre-filled search form in the "Server not found" message page so that a search could be done from there with a single click.