This appears related at least to 140_backport_default_internet_apps.patch which stops even loading the XML files from /usr/share/gnome-control-center/default-apps (why does firefox ship an XML file there?)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/708382 Title: [regression] cannot create "custom" preferred applications -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
