Designed by Typotheque
Zilla Slab is Mozilla's core typeface, used for the Mozilla wordmark, headlines and throughout their designs. A contemporary slab serif, based on Typotheque's Tesla, it is constructed with smooth curves and true italics, which gives text an unexpectedly sophisticated industrial look and a friendly approachability in all weights.
You can download font files directly and install them with Font Book. However, it’ll be much easier to install these fonts with RightFont — the best font manager for Mac.
These fonts are licensed under the Open Font License.
You can use them freely in your products & projects - print or digital, commercial or otherwise.