I have a strange problem with Firefox that is driving me completely nuts.

And I think I need someone to help me see the obvious.

I am using Firefox 158.0.1 (aarch64) with Firefox Multi-Account Containers 8.3.8.

I have a web site that won't open if I am not inside a container. And I have no clue why.

Firefox says: "The page isn’t redirecting properly" when opening without a container.

But if I open the same web page inside a container, it opens without any problem. It doesn't matter which container I use. Any will do.

I use the containers only to separate cookies. I never did anything to the settings. With another browser or curl, the web site doesn't do any redirect.