A month or so ago, ECF changed how it handles cookies. This caused problems especially with Firefox. I got a feeling they are rolling it out in small areas of the world at a time. Maybe they just changed where you are at. If you have popups blocked, unblock them and you might see a window to accept cookies or not. Another thing is to delete cookies from ECF
through Firefox and reboot Firefox. Did you see something like this with Edge? Have you had seen this a month or so ago, then it is probably something else.