Same problem as everyone else. Sign in window opens and closes. I have been able to sign in but the Eno window doesn't create a virtual card. I just called Capital One and their tech guy said to use Chrome or I should wait a few hours and see if it works then. What a low quality tech guy, but I am not surprised. I am thinking that Firefox has done something to cause this. It seems if they offer an extension, they should check to see it will work on their browser, kind of a no-brainer. I have updated on a regular basis when available. So can the Firefox tech guys please look into this.