Hi toride, If you're looking in Windows Task Manager, that will show you the processes which Firefox needs for stable operation. See this : Multi-Process Firefox: everything you need to know

Use Firefox's Task Manager to get a better idea of what is gobbling up resources and causing it to freeze: Task Manager - see what tabs or extensions are slowing down Firefox

It is Windows Task Manager not Firefox Task Manager. and it is Firefox that eating all the ram. this just started to happened four days ago. to day is 7/18/2019 Thank You

I have the same problem, especially when I come off a VPN. I close all active tasks, then there are always three background tasks, one of which can only be closed by rebooting the computer. This has been happening for weeks. I just literally downloaded the latest version of Firefox after a clean removal using Revo. About fed up with Firefox and it's constant problems.

I have the same problem. So is there anyway now to stop multiple Firefox's running? If there isn't I have to stop using Firefox and after many years use.

Hello All,

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\"

I had that and other issues with Firefox. I finally gave up and moved to Edge. It's not perfect, but doesn't have all the issues that Firefox had through last week.