This isn't a Firefox bug as much as it is acpi. fire fox does use a bit more cpu% than most apps but since you were running 2 apps and they both went up when you unpluged the ac/dc than its more battery or acpi. firefox isnt going to change just because you unplug laptop
This isn't a Firefox bug as much as it is acpi. fire fox does use a bit more cpu% than most apps but since you were running 2 apps and they both went up when you unpluged the ac/dc than its more battery or acpi. firefox isnt going to change just because you unplug laptop