Comment 277 for bug 191889

Someone marked my other bug, 441491 (https://bugzilla.mozilla.org/show_bug.cgi?id=441491) as a duplicate of this bug, and now that they're filed together it needs to be included in this discussion.

When using the profile manager, you can pick 'Work offline' or leave it unchecked, which is a user input decision. Despite that choice firefox will still consult network manager and change your decision even if you didn't want it to.

Effectively, if you are using network manager properly and are online, starting firefox and choosing 'work offline' will still land you online and loading the pages over the network, even though you actively tried to tell firefox not to do this.