Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

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Efficiency Mode

  • 3 odpovede
  • 2 majú tento problém
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  • Posledná odpoveď od Ed

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Firefox keeps going into efficiency mode and hosing my pc. I have end task from task manger and restart Firefox to clear it. I recently upgraded to Win 11.

Firefox keeps going into efficiency mode and hosing my pc. I have end task from task manger and restart Firefox to clear it. I recently upgraded to Win 11.

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This should disable it permanently:

Type about:config in the address bar > press Enter

- click 'Accept the risk and continue'

- search for dom.ipc.processPriorityManager.backgroundUsesEcoQoS > change the value to false > restart FF

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Hey Ed, I did what recommended and it stop Firefox going into Efficiency Mode. But I watched Firefox start eating up memory. After Firefox memory consumption reached 28 Gb the pc locked up. I had three Firefox windows open. One had one tab while minimize , another had three tabs while minimize and the other had four tabs with one open and playing news broadcast not full screen. Any ideas? Thanks, Harry

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hjlane2 said

Hey Ed, I did what recommended and it stop Firefox going into Efficiency Mode. But I watched Firefox start eating up memory. After Firefox memory consumption reached 28 Gb the pc locked up. I had three Firefox windows open. One had one tab while minimize , another had three tabs while minimize and the other had four tabs with one open and playing news broadcast not full screen. Any ideas? Thanks, Harry

See what happens after a while in Troubleshoot mode (https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode).

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