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Really, really high use of hardware (memory and cpu)

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It is really very strange and unbelievable! No page is open, but the memory occupies more than 700 MB and uses more than 20% cpu! What should I do exactly? I use Windows 11 24 H2

It is really very strange and unbelievable! No page is open, but the memory occupies more than 700 MB and uses more than 20% cpu! What should I do exactly? I use Windows 11 24 H2
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What does the about:processes page say?

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When using Firefox, the amount of memory and CPU usage is extremely high, even with a single screen, and the sound of the laptop fan is heard at the highest volume.

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processes page and Task Manager page

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