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When I open Firefox I get multiple Firefox.exe processes showing in my task manager. I am using Windows 7.

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When I open Firefox I get multiple Firefox.exe processes showing in my task manager. I am using Windows 7.

When I close a tab sometimes on of the processes will close also. But even with only one tab open, multiple Firefox.exe processes appear.

This starting happening in the last few days.

When I open Firefox I get multiple Firefox.exe processes showing in my task manager. I am using Windows 7. When I close a tab sometimes on of the processes will close also. But even with only one tab open, multiple Firefox.exe processes appear. This starting happening in the last few days.

Chosen solution

Thank you Zachary for this response. I did verify that e10 is turned on with Multiprocess Windows set at 1/1 (default). I will monitor usage level to see if this is higher than when multiprocess is not running and if necessary the link you provided had easy to understand information on how to reset. Thanks for your help.

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Additional System Details

Installed Plug-ins

  • Shockwave Flash 26.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0

More Information

Zachary_ 30 solutions 191 answers
Try referring to this thread; https://support.mozilla.org/en-US/questions/1147868
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FredMcD
  • Top 10 Contributor
3169 solutions 42803 answers

Well said, Zachary_

Well said, '''Zachary_'''
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Chosen Solution

Thank you Zachary for this response. I did verify that e10 is turned on with Multiprocess Windows set at 1/1 (default). I will monitor usage level to see if this is higher than when multiprocess is not running and if necessary the link you provided had easy to understand information on how to reset. Thanks for your help.

Thank you Zachary for this response. I did verify that e10 is turned on with Multiprocess Windows set at 1/1 (default). I will monitor usage level to see if this is higher than when multiprocess is not running and if necessary the link you provided had easy to understand information on how to reset. Thanks for your help.
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cor-el
  • Top 10 Contributor
  • Moderator
15584 solutions 141084 answers

You may see three or more Firefox processes running.

  • one process for the main Firefox thread (user interface)
  • one or more processes for content threads set via "Options/Preferences -> General -> Performance" (dom.ipc.processCount)
  • one process for the compositor thread (Windows)

You can look at "Multiprocess Windows" to see the current multi-process state.

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

See also:

You may see three or more Firefox processes running. *one process for the main Firefox thread (user interface) *one or more processes for content threads set via "Options/Preferences -> General -> Performance" (dom.ipc.processCount) *one process for the compositor thread (Windows) You can look at "Multiprocess Windows" to see the current multi-process state. *"Help -> Troubleshooting Information" -> Application Basics: Multiprocess Windows See also: *https://www.ghacks.net/2016/07/22/multi-process-firefox/ *https://www.ghacks.net/2016/11/11/firefox-52-nightly-quantum-compositor-has-landed/ *https://hacks.mozilla.org/2017/04/firefox-53-quantum-compositor-compact-themes-css-masks-and-more/
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