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How to disable multiple task manager processes?

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I had once changed a setting which allowed FireFox to only one run process, but somethings changed and now there are about 15 firefox.exe processes running in my task manager and would like to change it back to a single process.....what setting fixes this?

I had once changed a setting which allowed FireFox to only one run process, but somethings changed and now there are about 15 firefox.exe processes running in my task manager and would like to change it back to a single process.....what setting fixes this?
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  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0

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McCoy
  • Top 10 Contributor
532 solutions 5034 answers

Helpful Reply

Hello BigJohnny,

Multi-process (e10s) can no longer be disabled on the "about:config" page - see :

https://techdows.com/2019/05/mozilla-firefox-68-doesnt-allow-turning-off-e10s.html

If however, you really want to disable it, you can set an environment variable to disable multi-process. :
• set MOZ_FORCE_DISABLE_E10S=1
How to set environment variables : http://www.computerhope.com/issues/ch000549.htm

You can use the set command to create a temporary environment variable.

  • open command prompt window
  • change to installation directory
  • type "set MOZ_FORCE_DISABLE_E10S=1" and press enter
  • type "firefox.exe" and press enter

How to use set command : http://www.computerhope.com/sethlp.htm


Or you could set an environment variable in the Windows Control Panel => System.

You can create a firefox-e10s.cmd file with this content:

set MOZ_FORCE_DISABLE_E10S=1 start "" "<path_to_firefox>\firefox.exe"

• (64-bit Firefox) "C:\Program Files\Mozilla Firefox\" • (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

(edit: typo)

Hello BigJohnny, Multi-process (e10s) can no longer be disabled on the "about:config" page - see : https://techdows.com/2019/05/mozilla-firefox-68-doesnt-allow-turning-off-e10s.html If however, you really want to disable it, you can set an environment variable to disable multi-process. :<BR> • set MOZ_FORCE_DISABLE_E10S=1<BR> How to set environment variables : http://www.computerhope.com/issues/ch000549.htm You can use the set command to create a temporary environment variable. * open command prompt window * change to installation directory * type "set MOZ_FORCE_DISABLE_E10S=1" and press enter * type "firefox.exe" and press enter How to use set command : http://www.computerhope.com/sethlp.htm -------------------------------------------------------------------------------------------------------- Or you could set an environment variable in the Windows Control Panel => System. You can create a firefox-e10s.cmd file with this content: set MOZ_FORCE_DISABLE_E10S=1 start "" "<path_to_firefox>\firefox.exe" • (64-bit Firefox) "C:\Program Files\Mozilla Firefox\" • (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\" (edit: typo)

Modified by McCoy

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Question owner

so is there a reason it uses so many processes? I'm looking at 12 processes right now. if I use just one process it ends up taking up to about 4 million kb of memory, but it's using about the same or more with all the processes as well

so is there a reason it uses so many processes? I'm looking at 12 processes right now. if I use just one process it ends up taking up to about 4 million kb of memory, but it's using about the same or more with all the processes as well
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cor-el
  • Top 10 Contributor
  • Moderator
17467 solutions 157838 answers

It is quite normal to see more Firefox processes running.

  • one process for the main Firefox thread (user interface)
  • one or more content processes (default is 8), see:
    Options/Preferences -> General -> Performance
    remove checkmark: [ ] "Use recommended performance settings"
  • one process for the compositor thread
  • one process for the 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

See also the Remote Processes section further down for more detail.

It is quite normal to see more Firefox processes running. *one process for the main Firefox thread (user interface) *one or more content processes (default is 8), see:<br>Options/Preferences -> General -> Performance<br>remove checkmark: [ ] "Use recommended performance settings" *one process for the compositor thread *one process for the 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":<br>Multiprocess Windows<br>Remote Processes See also the Remote Processes section further down for more detail.
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Bill Mayhew 0 solutions 10 answers

I got a half-dozen firefox.exe processes on my laptop after updating to 68.

Is this my payback for keeping Firefox (manually) updated??

(NOT a happy camper, but at least it's still (nominally) working...)

I got a half-dozen firefox.exe processes on my laptop after updating to 68. Is this my payback for keeping Firefox (manually) updated?? (NOT a happy camper, but at least it's still (nominally) working...)
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Bill Mayhew 0 solutions 10 answers

6 processes on a single-core CPU are a bit much... esp. when you add in all the Windows disServices ;) ... I currently have 13 svchost.exe's .

But, good news... performance mysteriously improved, now 90%+ idle. (68.0.1 64-bit)

But I still have 6 firefox.exe's... mysteriously only using a total of 7% CPU... which I can live with.

6 processes on a single-core CPU are a bit much... esp. when you add in all the Windows disServices ;) ... I currently have 13 svchost.exe's . But, good news... performance mysteriously improved, now 90%+ idle. (68.0.1 64-bit) But I still have 6 firefox.exe's... mysteriously only using a total of 7% CPU... which I can live with.

Modified by Bill Mayhew

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Eldar Value 4 solutions 45 answers

Bill Mayhew said

6 processes on a single-core CPU are a bit much... esp. when you add in all the Windows disServices ;) ... I currently have 13 svchost.exe's . But, good news... performance mysteriously improved, now 90%+ idle. (68.0.1 64-bit) But I still have 6 firefox.exe's... mysteriously only using a total of 7% CPU... which I can live with.

if you're think you've a malware running in your pc you can try to perform a scan with freeware portable tool called adwcleaner.

To disable multi processes go to `about:config?filter=browser.tabs.remote.autostart` and make sure to change the value to `false`, after you've done that, restart firefox.

''Bill Mayhew [[#answer-1245474|said]]'' <blockquote> 6 processes on a single-core CPU are a bit much... esp. when you add in all the Windows disServices ;) ... I currently have 13 svchost.exe's . But, good news... performance mysteriously improved, now 90%+ idle. (68.0.1 64-bit) But I still have 6 firefox.exe's... mysteriously only using a total of 7% CPU... which I can live with. </blockquote> if you're think you've a malware running in your pc you can try to perform a scan with freeware portable tool called adwcleaner. To disable multi processes go to `about:config?filter=browser.tabs.remote.autostart` and make sure to change the value to `false`, after you've done that, restart firefox.
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cor-el
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^ Quote; To disable multi processes go to `about:config?filter=browser.tabs.remote.autostart` and make sure to change the value to `false`, after you've done that, restart firefox.

That is not correct. In Firefox 68 and later you can no longer disable multi-process via a pref. As posted above, you need to use an environment variable (MOZ_FORCE_DISABLE_E10S=1).

^ Quote; ''To disable multi processes go to `about:config?filter=browser.tabs.remote.autostart` and make sure to change the value to `false`, after you've done that, restart firefox.'' That is not correct. In Firefox 68 and later you can no longer disable multi-process via a pref. As posted above, you need to use an environment variable (MOZ_FORCE_DISABLE_E10S=1).
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Bill Mayhew 0 solutions 10 answers

I expect a league-leading browser like Firefox to accommodate ALL its long-term users - even on low-end laptops - WITHOUT *workarounds* like environment variables. Firefox should be able to tell when it's running on single-core machines and STOP adding MULTIPLE PROCESSES to the workload,

VERY TACKY, Mozilla!!!

I expect a league-leading browser like Firefox to accommodate ALL its long-term users - even on low-end laptops - WITHOUT *workarounds* like environment variables. Firefox should be able to tell when it's running on single-core machines and STOP adding MULTIPLE PROCESSES to the workload, VERY TACKY, Mozilla!!!
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