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73416ba
(Get the code!)
If NetworkManager is not able to control your default your (and the 0.6 that Ubuntu includes isn't capable of doing so for things like mobile broadband or PPPoE, which 0.7 fixes) then you should turn NetworkManager off and use your normal distro network config scripts.
NetworkManager is appropriate for cases where it is able to control the default route. If it is not, then you should turn it off for that machine.
If Firefox doesn't assume that when the NM dbus service is not around, that the machine is online, then FF needs to be fixed to assume so. But when the NM service is around, then it is assumed that NM is managing the default route, and thus can be asked for authoritative network status. If you have made your primary network device "managed" rather than roaming mode (an Ubuntu-specific patch to NetworkManager) then you aren't using a configuration supported or cared about by upstream NetworkManager developers. In that case, turn off NetworkManager.