adb push user.js /system/b2g/defaults/pref
adb shell sync && adb reboot
== Wifi Logging ==
* turn on the wifi debug message in Settings/Device
information/More Information/Developer/Wi-Fi output in adb,
* attach the debug message using "adb logcat". You need to turn off/on the wifi to
output the debug message.
== Addon to Firefox web browser to see Firefox OS Simulator ==