There are 2 repositories under firefox-os-app topic.
Loqui IM allows you to use all your chat accounts in just one FirefoxOS or Ubuntu Touch app.
Test app created with Firefox WebIDE
QR/barcode scanner for Firefox OS
Firefox OS app: Edit metadata of audio files
Repo for the Firefox OS port of Open Food Facts
This repository moved. Please use the new location https://gitlab.com/pandark/knight-fall
FFOS app: Mandelbrot fractal explorer
Firefox OS app to convert between timezones
Firefox OS App to show 🎮xbox gamertag information and game progress
Firefox OS App for displaying localised weather
Run Firefox OS apps directly in browser through ServiceWorker
Firefox OS app to learn the countries of the world