According to this page there is one: - http://www.mozilla.org/en-US/styleguide/products/firefox-os/typeface/ http://www.mozilla.org/en-US/styleguide/products/f

According to this page there is one: - http://www.mozilla.org/en-US/styleguide/products/firefox-os/typeface/ http://www.mozilla.org/en-US/styleguide/products/firefox-os/... It looks like it's included in the zip files when you download it at the bottom.