It seems that actions assigned to PanelMenuItems are not invoked in Firefox 3.0.1. It tested fine on FF2, IE6 and IE7.

You can see this in the 3.1.6 Live Demo.
http://livedemo.exadel.com/richfaces-demo-3.1.6.GA/richfaces/panelMenu.jsf?c=panelMenu

Who would normally report this to the JBoss development (ie via the Jira)?

I had also started this thread:
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=139851