We appreciate you letting us know about this. The extension should work for Firefox. the best thing to try and do first would be to make sure Firefox is up to date. Then check and see if Eno is up to date as well. If you've checked both of those things, we recommend that you reach out to us on Twitter at www.twitter.com/AskCapitalOne or on Facebook at www.facebook.com/CapitalOne so we can chat more about this.