Builds are made from Firefox OS code only.
You can install them via fastboot and recovery.
They are done each night automatically.
Nightly : everyday
Test : Monday
v2.5 (Aurora) : Tuesday
v2.2 (Beta) : Wednesday
v2.1 : Thursday
v2.0 : Friday
v1.4 : Saturday
I don't test all of them, some builds may have issues and/or erase your datas.
What doesn't work
Calc - Firefox OS on Nexus 5
What do you need on Firefox OS to use it as your only ROM on Nexus 5 ?
- Mozilla source code
- my modifications and userconfig