Builds are made from Firefox OS code only.
You can install them via fastboot and recovery.
I just change the URL where Firefox OS download FOTA.
They are done each night automatically.
They include all latest features like Spark.
They are done each monday.
Aurora (Alpha) : v2.2
Beta : v2.1
I don't test all of them, some builds may have issues and/or erase your datas.
What doesn't work (nightly - 03/24/2015)
- Notification LED
- Please tell me ?
What do you need on Firefox OS to use it as your only ROM on Nexus 5 ?
- Mozilla source code
- my modifications and userconfig