"1 new add-on installed" window displayed Rated 4 out of 5 stars

After installing R-kiosk, and restarting browser, the "1 new add-on installed" window is displayed. The "find updates" button on this dialog can be used to break the kiosk mode. How do I disable the "1 new add-on installed" windows. Using Iceweasel 3.5.12 on Debian. Thanks.

This review is for a previous version of the add-on (0.8.1).