SC.say dialogs on Firefox in SmartGWT.Mobile not working

Firefox 17.0.6 ESR, SmartGWT.Mobile 2013-07-05 and public site (2013-08-18).

Go to http://smartgwt-mobile.smartclient.com/#Widgets/Dialogs/Prompts

Pressing the buttons on these SC dialogs does nothing.

Not critical but annoying for developing using desktop Firefox. Works on Chrome and Safari.

Thanks,

Matt