Thank you for taking the time to report this bug and helping to make
Kubuntu better. The KDE3 version of KNetworkManager has been
discontinued by its original authors. This unfortunately means that
there will be no more bugfix releases, and updates in general will be
limited to those fixing
I checked this within the last month, and it was no longer a problem --
Firefox worked OK when interfaces is blank and knetworkmanager handles
the connection. (When I checked 6 months ago or so, at that time, it
was still a problem.) Maybe one of the numerous Firefox updates solved
the problem.
