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Firefox freezes up every afternoon between 3 and 4, what Windows Setting is doing this?

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This happens every freaking DAY!!! I am running Windows 10.

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Check the Windows 10 Task Schedule top see what is set for that time.

Quite possibly it could be your Security Suite, where that type of setting might be in that program. That's what I had to change after an upgrade of my A / V program; it was using 75% CPU when the update ran and was worse on some days where there were a large number of new definitions to add.