A custom family for Mozilla by Typotheque
To quickly grab the generated fonts you can download the latest release. You can also find Zilla Slab hosted on Google Fonts and Mozilla's own CDN to reference in your projects directly. If you would like to generate the fonts from their original source, read on.
virtualenv env
source env/bin/activate
pip install -r requirements.txt
# dependencies to generate webfonts
brew tap bramstein/webfonttools
brew update
brew install bramstein/webfonttools/sfnt2woff
brew install bramstein/webfonttools/woff2
build whilst env virtualenv is active
cd sources
sh build.sh