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73416ba
(Get the code!)
Each distro handles ignored devices differently. Even though NM would know the MAC address of the device that it is told to ignore, there's no way NM could know whether or not that device is up and active, precisely because you've told NetworkManager to ignore that device.
NM 0.7 will help this because it will work for a lot more users (static IP, network before login, etc).
However, if you are making NetworkManager ignore certain devices, then you cannot expect NetworkManager to know anything about those devices, much less whether that device is active and has an IP address and is therefore online. I'd suggest turning off NetworkManager in that case, and then FF should just thing you're online.