lithopsian wrote:I don't restore sessions, don't even know how.
You don't have to. Firefox will do it for you in all sorts of situations. Usually though you'll see a web page loaded when you start, so perhaps not that. Still, if truly deleted cookies come back without you even visiting the page then you have some major issues. I'd keep digging because that's not right.
I just removed about 10 of those re-occurring cookies. I have no idea how to fix it, so it's just one of those little annoyances of life. I'll let the programmers dig.