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Why so many firefox's are launch when only one is running? Resource hog.

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HvyMetal53
HvyMetal53
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Task manager (screen capture) is showing 9 Firefox's open when only one is open with only one tab. This is causing system resource and locking up my computer at times.

Task manager (screen capture) is showing 9 Firefox's open when only one is open with only one tab. This is causing system resource and locking up my computer at times.
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cor-el
cor-el
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It is quite normal to see three or more Firefox processes running.

  • one process for the main Firefox thread (user interface)
  • one or more content processes set via dom.ipc.processCount
    Options/Preferences -> General -> Performance
    remove checkmark: [ ] "Use recommended performance settings"
  • one process for the compositor thread (Windows;graphics)

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

  • "Help -> Troubleshooting Information" -> "Application Basics":
    Multiprocess Windows
    Web Content Processes

See also;