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Firefox is preventing my computer to sleep

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Firefox is preventing my computer to sleep. I can see this in ACTIVITY MONITOR / ENERGY... FireFox is the only application listed as YES under PREVENTING SLEEP. Anyone have a solution?

Firefox is preventing my computer to sleep. I can see this in ACTIVITY MONITOR / ENERGY... FireFox is the only application listed as YES under PREVENTING SLEEP. Anyone have a solution?
Pridėtos ekrano nuotraukos

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You have to quit firefox before putting your computer to sleep. Afaik, firefox resists being quit through mac os for some reason, so it keeps it awake if you try to sleep or restart it. If you quit it through the dock, however, it won't prevent it from sleeping.