GoKawiilFirefox.com rebuilt entirely with native CSS, no preprocessors used
Mozilla worked with Lincoln Loop and a design lead to rebuild Firefox.com using only modern, native CSS, dropping preprocessors like Sass entirely. The project exported custom properties straight from design files and used CSS Grid and Flexbox, building a system of more than 70 components and 25 page templates as Wagtail components so non-engineers can assemble pages. The site now supports 19 locales, with a lightweight branded stylesheet ensuring older browsers still get basic accessible styling.