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Firefox Opens Five .exe

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This morning I noticed that Firefox is using over 600 megs of memory and there are five instances of the Firefox .exe running. This is when just opening FF with no tabs open. Win 10 Pro version 1809 64 bit, FF 62.03 64 bit. Please see attached images.

This morning I noticed that Firefox is using over 600 megs of memory and there are five instances of the Firefox .exe running. This is when just opening FF with no tabs open. Win 10 Pro version 1809 64 bit, FF 62.03 64 bit. Please see attached images.
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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0

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Question owner

For the record I tried this fix:

(3) Double-click the browser.tabs.remote.autostart.2 preference to switch the value from true to false

But no luck. Also of note this happens with the Opera Browser as well so maybe it's a Windows issue. Opera opened 8 instances. Oddly it only happens with browsers not other applications.

Perhaps it's some kind of Browser "feature" that is supposed to improve performance but it seems highly illogical that having several instances of the same .exe running at the same time would improve performance.

For the record I tried this fix: (3) Double-click the browser.tabs.remote.autostart.2 preference to switch the value from true to false But no luck. Also of note this happens with the Opera Browser as well so maybe it's a Windows issue. Opera opened 8 instances. Oddly it only happens with browsers not other applications. Perhaps it's some kind of Browser "feature" that is supposed to improve performance but it seems highly illogical that having several instances of the same .exe running at the same time would improve performance.
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cor-el
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16657 solutions 150560 answers

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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)
  • https://support.mozilla.org/en-US/kb/performance-settings

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
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<br>Options/Preferences -> General -> Performance<br>remove checkmark: [ ] "Use recommended performance settings" *one process for the compositor thread (Windows;graphics) *https://support.mozilla.org/en-US/kb/performance-settings You can find the current multi-process state on the Troubleshooting Information (about:support) page. *"Help -> Troubleshooting Information" -> "Application Basics":<br>Multiprocess Windows<br>Web Content Processes
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Question owner

Ok thanks. It's the fact that the task manager shows the FF.exe running five or more times that threw me off. For example Edge shows it's sub-processes with different names. Each of the FF entries points to the firefox.exe file. Lowering the number in "content process limit" does decrease the memory footprint but I notice at default settings FF uses about 3.5 times more memory than Edge.

Ok thanks. It's the fact that the task manager shows the FF.exe running five or more times that threw me off. For example Edge shows it's sub-processes with different names. Each of the FF entries points to the firefox.exe file. Lowering the number in "content process limit" does decrease the memory footprint but I notice at default settings FF uses about 3.5 times more memory than Edge.
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