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Firefox high CPU usage while turned off

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Hi, I recently found out that Firefox is using around 70% CPU in background while the browser is not even running. I cannot find out why this is happening.

Hi, I recently found out that Firefox is using around 70% CPU in background while the browser is not even running. I cannot find out why this is happening.

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Ve Správci úloh nejde ten proces ukončit? Zkontroluj si počítač na přítomnost škodné.