This API is available on Firefox OS for internal applications only.
The MozPowerManager.cpuSleepAllowed property determines if the device's CPU will sleep after the screen is disabled. Setting this attribute to false will prevent the device from entering the suspend state.
Syntax
var isTheCPUAllowedToSleep = navigator.mozPower.cpuSleepAllowed
Value
Return a boolean.
Specification
Not part of any specification.