I don't know if it helps, but in OpenJDK 1.6.0_22 everything works just fine, but maybe you use icedtea6-plugin and I use icedtea-plugin.
# lsb_release -rd Description: Ubuntu 11.04 Release: 11.04 # java -version java version "1.6.0_22" OpenJDK Runtime Environment (IcedTea6 1.10.4) (6b22-1.10.4-0ubuntu1~11.04.2) OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/726096 Title: JNLP files can not be launched out of Firefox To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openjdk-6/+bug/726096/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs