http://mozilla.github.io/Fira/
Though the Mozilla Foundation has been around for ten years now, they have only recently released their own font, Fira Sans, which is available as a free download from their site.
Fira Sans is available in four weights, including an italic variant for each weight, as well as a monospaced variant in two weights (regular and bold).
The typeface itself was designed by notable type aficionados Erik Spiekermann and Ralph du Carrois, and according to the style guidelines for the Firefox OS, “aims to cover the legibility needs for a large range of handsets varying in screen quality and rendering.”
See the Fira Road Map for further information on upcoming releases. Please add your comments or questions within the document.
If you're interested in contributing, see our Fira Contribution Documentation. Please add your comments or questions within the document.
Use this font on your website!
<link rel="stylesheet" href="https://code.cdn.mozilla.net/fonts/fira.css">
Further information on the design and specifications of the Fira typeface can be found at Carrois Studio.
Fira can also be found in these foundries:
1001 Fonts
Adobe Typekit
Google Fonts
Font Squirrel