This extension worked great when I first added it. Like everyone else lately, I find it no longer works, especially since the last firefox update that removed the extension buttons at the top where you could click on the extension you wanted to use. I contacted Capital One to complain and suggest they need to allow people the ability to create new virtual cards from within the app or on the website. I was told they are working on all these things. And that Eno is a third party thing separate from Captial One which I don't see where you can contact them from. Only suggestion was to use Google Chrome instead which I chose not to use anymore several years ago. Hope this info is helpful to someone out there!