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23 apps of Firefox running in Task Manager.

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Happened to look in Task Manager, , there are 23 applications of Firefox running. Why ? I have two windows and a total of 7 tabs open. What's up with that ?

Happened to look in Task Manager, , there are 23 applications of Firefox running. Why ? I have two windows and a total of 7 tabs open. What's up with that ?

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Firefox normally reserves content windows, so they are ready to be used if you open more tabs.

It is quite normal to see more Firefox processes running.

  • process for the main Firefox thread (user interface)
  • one or more content processes
    you see more content processes when Fission is enabled
  • process for the compositor thread
  • process for extensions
  • process for WebRender when this feature is enabled

There are several toolkit.aboutProcesses prefs on the about:config page to show more info. You can find the current multi-process state on the Troubleshooting Information page (about:support).

  • "Help -> Troubleshooting Information"
    "Application Basics":<be>Multiprocess Windows and Fission Windows
    "Remote Processes" (Web Content)

You can check the about:memory and about:processes pages for info about all processes. See also the about:unloads page for info about the tabs.