The UX team at Firefox has just sent me some screengrabs from their work on a smartphone using the new OS. The Fira typeface will be available under and Open Source license. The version currently on GitHub is not the final one. We made some small changes before we officially shipped our final fonts. Those should be available soon.
These are small reproductions of reproductions. The real screens are much sharper, of course.
I do not think that Firefox will start selling fonts. There are hardly any features because the fonts will be mainly used for the web.
Sorry, but these are reproductions of reproductions.
Here you get the latest version: click if you are interested!