Comment 391 for bug 191889

No, NM 0.7 will not solve the problem. AFAIK it can't manage all possible network interfaces, and even if it could there will still be people who choose to run NM but have some active interfaces not managed by NM, no matter how much we wish they wouldn't. And if we treat StateChange messages as reliable they will blame Firefox for being broken.

The NM issues are covered pretty well here: http://bugzilla.gnome.org/show_bug.cgi?id=418745#c13
I agree with Martin's comment there and have just attached a followup comment of my own, which echoes what I've already said in this bug. It seems to me that NM could enumerate the active interfaces (like ifconfig does) and detect when there are interfaces in that list that it isn't managing (and aren't loopback), and in that case, refrain from sending StateChange messages.