'''What does it mean''':
Power usage for a given change is difficult to measure. Power usage is directly correlated with CPU usage, and also with the use of various hardware features of the phone.
'''Verification Steps''':
If you have a power harness available to you, you can do before and after power measurements by following the instructions on [https://developer.mozilla.org/en-US/Firefox_OS/Performance/Power this page]. If you don't have a power harness, please contact the performance team (#fxos-perf on IRC) for help.