Hi Countbelisarius, Actually, 4-6 processes running is normal for Firefox at startup. Firefox has a built-in Safe Mode: Troubleshoot Firefox issues using Safe Mode to help determine why you are using so much memory and CPU.

It is m6 understanding that setting processcount to 1 overrides this. But the essence of question is what changed overnight for Firefox to run multiple recesses and override the pricesscount value. Is there something else I need to change?

Firefox 68 doesn't have the option from Firefox 48-67 to disable multiprocess -- if they still appear in about:config they are ignored now.

I think the minimum number of processes in multiprocess Firefox is 2-4 processes (when you have reduced content processes to 1, see: Firefox's performance settings).

Here's an article on ghacks which might help: Multi-Process Firefox: everything you need to know

Can you expand memory in paging file or ready boost?

Hello Countbelisarius,

You can no longer disable e10s on the "about:config" page, but you can set an environment variable:

MOZ_FORCE_DISABLE_E10S - 1

In this thread (you'll have to scroll down) is explained how :

http://custombuttons.sourceforge.net/forum/viewtopic.php?t=44997&p=95499