I have two Geeksphone Keons in here and I've been speaking at events about Firefox OS. I develop mobile apps and web for both Android and iOS and I find that developing for Firefox OS is very refreshing. The OS gets out of your way and you're free to create your own vision for an app.
You're not restricted to a walled garden and don't need to use the Firefox Marketplace if you don't want to. Your app can be on the device or hosted on your server and have an offline mode using appCache.
For those that want to know more, take a look at the developer hub at:
All you need to develop is a copy of Firefox with the the Firefox OS Simulador add-on installed. The rest is just HTML/CSS/JS. The hardware is exposed using the webAPI which can be seen at https://wiki.mozilla.org/WebAPI.
they are very good to use and surprising enough given the price and low specs.
not all apis are implemented yet so I would not recommend using it as your primary phone just yet. I use mine as primary phone during weekends and am happy. It still needs polish, bugfixes and more apps but developing for it is pretty fun and I like the architecture
You're not restricted to a walled garden and don't need to use the Firefox Marketplace if you don't want to. Your app can be on the device or hosted on your server and have an offline mode using appCache.
For those that want to know more, take a look at the developer hub at:
https://marketplace.firefox.com/developers/
All you need to develop is a copy of Firefox with the the Firefox OS Simulador add-on installed. The rest is just HTML/CSS/JS. The hardware is exposed using the webAPI which can be seen at https://wiki.mozilla.org/WebAPI.
:-D
PS: I am a Mozilla Rep.