Comment 195 for bug 191889

Agreed. My patch is just a quick workaround to make Firefox usable on systems where NM might be misconfigured/misplaced or whatever.
I also think that NetworkManager should know when its managing the default route or not but that's not to be discussed here probably.
I also _guess_ that there might be rare situations where even NM 0.7 doesn't manage the network connection even if it's running. So personally I think the configure check isn't a good idea anyway and it's a compile time switch whereas that has nothing to do with the version which is actually running at runtime.