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developer settings. 
Battery 
Check the current battery level and enable power save mode. 
When the power save mode is enabled, the phone’s data, 
Bluetooth, and GPS connections are automatically turned off. 
You can manually turn them back on. You can also set the 
phone to turn on power save mode automatically when the 
battery drops to a certain point. 
Device Storage 
Check memory information for your phone’s internal storage. 
Media Storage 
Check memory information for your phone’s external microSD 
card. You can check USB mass storage and connect the 
phone to your computer via a USB cable to manage your 
microSD card files on the computer. 
Improve B2G OS 
Touch Improve B2G OS from Settings if you want to help 
improve the phone system. 
Touch Send Mozilla Feedback to open the browser and write 
you feedback and suggestions. You can also check Submit 
performance data or select an option below Crash reports to 
let the phone share performance data or send Mozilla a report 
when a crash occurs.