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An instance of firefox is running wich takes +60% of my cpu

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  • 1 有這個問題
  • 最近回覆由 cor-el

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So there are 7 instance's of Firefox (this is normal) but i have 4 extra's, and 1 of those extra instance's takes +60% of my cpu, any fixes?

附加的畫面擷圖

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yes, FF is a memory hog.

im not a FF programmer, but each tab tends creates its on instance

so what you can do is a right-click on the disturbing instance and execute an End Process" to see which website was sucking up memory

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It is quite normal to see more Firefox processes running.

  • process for the main Firefox thread (user interface)
  • one or more content processes, see:
    Options/Preferences -> General -> Performance
    remove checkmark: [ ] "Use recommended performance settings"
  • process for the compositor thread
  • process for extensions
  • process for WebRender when this feature is enabled

You can find the current multi-process state on the Troubleshooting Information page (about:support).

  • "Help -> Troubleshooting Information"
    "Application Basics": Multiprocess Windows
    "Remote Processes" further down

See also the about:memory page for information about the process IDs.


You can check the Firefox Task Manager (about:performance) and about:memory pages.

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