Rated 5 out of 5 stars

OK. Got it working in Ubuntu 10.10 w/FF 6.0.1. Enter "/usr/bin/dbus-send" (no quotes) for the executable. Then enter "--print-reply --dest=org.gnome.SessionManager /org/gnome/SessionManager org.gnome.SessionManager.RequestShutdown" (no quotes) for the Arguments. This will allow a shutdown without prompting for a password.

This review is for a previous version of the add-on (0.7.1-signed).  This user has 2 previous reviews of this add-on.