Unfortunately, plugins have preference over the setting you refer to, so the acroread Firefox plugin takes over before this setting is even checked. You'll need to actually disable the plugin if you would like firefox to open a handler instead.
** Changed in: acroread (Ubuntu) Status: Confirmed => Invalid -- acroread 9 in hardy overrides application settings in firefox https://bugs.launchpad.net/bugs/361478 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