Just start Firefox when you startup windows. Why?

Then there's something Russian. I have a win 7 laptop. I looked in autostart (msconfig) and there was nothing. Ideas from where it starts? (every time I start win)

Look at the general settings in Firefox, because you can also set something like that.

I can't do it

Try this:

http://www.chameleon-managers.com/windows-startup-manager/freeware.php

With the help of this tool you can see what starts everything: https://docs.microsoft.com/...s/autoruns

I assume that in the "Startup" Firefox is listed and activated.

Go to Task Manager> Startup and disable Firefox there by right-clicking.