Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

CPU jumps to 50% when exiting Firefox, then stays there. Why?

  • 2 uphendule
  • 6 zinale nkinga
  • 1 view
  • Igcine ukuphendulwa ngu hysan

more options

I am using WinXP and Firefox 26.0. 4GB RAM

From looking at Windows Task Manager I came to realise that Firefox continues to run after Exit. It NEVER closes, and continues to use 50% of CPU. Needed to use End Process.

Then, watching Windows Task Manager some more I discovered that the process was NOT using that CPU while running. Only after Exit did the CPU usage suddenly jump to 50%, and stay there. Only End Process closes Firefox.exe.

Any help or advice appreciated.

I am using WinXP and Firefox 26.0. 4GB RAM From looking at Windows Task Manager I came to realise that Firefox continues to run after Exit. It NEVER closes, and continues to use 50% of CPU. Needed to use End Process. Then, watching Windows Task Manager some more I discovered that the process was NOT using that CPU while running. Only after Exit did the CPU usage suddenly jump to 50%, and stay there. Only End Process closes Firefox.exe. Any help or advice appreciated.

All Replies (2)

more options

Use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar.

See:

more options

Thanks. But I was already using Exit (rather than clicking the close X), having already read that advice on earlier complaints about similar problems.

Any "next thing to try"?