In current implementation, global event hook is unregistered when all Firefox windows are minimized. One thing we can do for reducing power usage is adding more situations that global event hook is unregistered.
Bug 1742656 Comment 8 Edit History
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In current implementation, global event hook is unregistered when all Firefox windows are minimized. One thing we can do for reducing power usage is adding more situations that global event hook is unregistered. - https://searchfox.org/mozilla-central/rev/7fb9750a14e99267a77328559c2fd022e360d99b/widget/windows/WinWindowOcclusionTracker.cpp#934