How to configure firefox browser?

Question

Browsers

I found a video with the antidetect program
https://www.youtube.com/watch?v=TjpdliejP-8
https://www.youtube.com/watch?v=R6HfAHsx49o
It seems nothing complicated
How can I configure firefox settings?
The video shows that some kind of json file is being created.
Maybe someone knows where to screw it in the portable version of the browser?
And another question, parallel, for those who are in the subject.
How to make each tab have its own separate session?
Let's say in the first tab we go to VK under one login and in another tab under a different login.

Answer 1

The settings are stored in pref.js , a clean profile is created via firefox -p or handles the profiles.ini / profile folder and shoves the file there. Probably the same for portable.