I have the same issue when tried to add custom protocol handler this way. It looks that firefox 3.5 has new style for doing this. After playing with it a bit I found that network.protocol-handler.external and network.protocol-handler.app are (maybe) not used anymore. Instead network.protocol-handler.expose.<your protocol> is required to be False and then when click on link of this type one will be asked for application to handle it. It's important not to type <protocol>:// in address bar but click on link of that type or you'll get the same error. Then your protocol will appear in Edit->Preferences->Applications. So it's not ubuntu bug, just a firefox change.
-- Impossible to associate an application with the telnet-protocol https://bugs.launchpad.net/bugs/480502 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs