Open Food Facts mobile app
This application is based on Apache Cordova framework which allows you to develop for multiple platforms (iOS, Android, Firefox OS for a few of them) at the same time.
Build
Here are the steps to build and test the application. Be aware that it's an alpha version at the moment.
First, clone it.
Then, will need Apache Cordova installed and you may use a Firefox Developer Edition on version 39 at least; it provides developing tools for Cordova framework.
To install Apache Cordova, you can use Node Package Manager.
npm install -g cordova
Install also the platforms you need. For example
cordova platform add firefoxos
Use cordova platform to know which platform you can install.
Now, run Firefox Developer Edition and open WebIDE (Shift+F8). Click Projects
and Open Packaged App... and find the cloned repository of cordova-app. You
should now have the application opened in WebIDE and you can run it into a
Firefox OS simulator or onto your FirefoxOS phone.
Barcode scanner
You may also have to install Apache Cordova plugin for barcode scanning.
cordova plugin add com.phonegap.plugins.barcodescanner
However, this plugin is not compatible with Firefox OS (see sources on Github). It seems that there is no barcode scanner plugin for Cordova (see here).
Development notes
Instructions for Android and the version of the app that uses the Moodstocks scanner plugin (iOS and Android only) http://en.wiki.openfoodfacts.org/Mobile_App_Development_Notes