I'm a web developer on mozilla.org, so can provide some information here.

The "mozUITour" API is specific to Firefox 29, and can only be used on mozilla.org, which is a white-listed domain that is hard-coded into the browser.

The API is also pretty basic, in that it can highlight a limited number of target icons, and open a limited choice of menu's. The purpose of the API is strictly for on-boarding flows, such as this. It also only works over https and requires a secure connection.