ASP.NET MVC Forms Authentication Domain属性在Firefox中中断登录

I am attempting share authentication across multiple ASP.NET MVC web apps. The apps have different subdomains, e.g. x.example.com, y.example.com. I have generated a machine key and added it to the web.config of the apps. I have added the domain attribute to the forms tag (domain = "example.com"). I am attempting share authentication across mul