Update: Let me just start with my latest review of this extension- it's mostly broken. Not sure if it's simply related to FIrefox updates, but this extension rarely works these days. It's much more trouble than it's worth. I can no longer recommend its use.

Sadly, there is no other way (that I know of) to generate virtual card numbers without using the extension. So, that means the virtual cards feature is generally not available now.

It's disturbing that a company like Capital One would allow one of their financial products/services to be so unreliable.

Old review:
As usual, reviews are all love or hate (1 star or 5 star). Such absolutism (all-or-nothing think) is rarely useful to anyone. So, first, throw out all of the 1's and 5's and dig deeper into the reviews that have actual thoughtful analysis of the product.

In this particular experience, the Capital One add-on, Eno, is wonderfully useful... when it works. For me, a frequent online shopper, it provides two things I value highly: convenience and security. I love having it available at shopping sites, with all the info I need to complete the purchase. I don't have to look up my card info and manually fill it in. Very nice.

Sadly, some updates to Firefox and a few sites' code break the add-on. But I've found this to be true of many of the add-ons I use. Anytime an app or an operating system pushes out an update, it's not uncommon for software that interacts with it to break or have issues. So, this is not a particular sin of this add-on. It applies to many add-ons.

Most importantly, I love Eno and the feature from Capital One to use a virtual number. The add-on just makes it easier to use. One can still interact with the Capital One website to manage their virtual numbers. Due, once again to occasional breaks from browser updates or particular sites, I have had to get creative when using the feature. This can be frustrating.

It's not perfect, but overall, it works more than it doesn't, and the ability to generate a one-time use number is invaluable when it comes to online security. Keep in mind, the virtual number feature is very flexible. You can keep using the number for that particular site, but lock it, so it's only usable when you allow it, you can just delete it, or leave it unlocked for one particular merchant only (e.g. for a subscription).

If you're not using a virtual number, you are asking to be hacked. Get this add-on, take a deep breath when it breaks from time to time, and feel a whole lot better when you use your credit card online.

Having the same trouble as everyone else - can't log in. It was a very useful feature so I hope they fix the problem soon.

worked for a year, but Firefox 85 (and MS Edge) have killed it. Unable to login anymore....

As others have commented, used to work but now unable to authenticate to app. This is with Firefox 85.0. It gets stuck in the authentication step. I deleted all my cookies and cache for *capitalone*. Hopefully gets fixed because it was a very useful feature.

It doesn't work at all. It looks like it is logging in and then it disappears. And the one time I did get it to assign a number, it got rejected by the site I was using. It's a total crock and waste of time and effort.

It just doesn't seem to work at all with Firefox. The extension prompts you to login and pops-up a separate window to enter your credentials, but after entering them it takes you right back to login again. You can run this circle as many time as you like.

This app do not work with Firefox, Chrome or anything. Stop sending emails. DOES NOT WORK

Every time I try to use it, it basically goes away and doesn't allow itself to be used on the page where I thought I'd use it.

App used to work great and I used it all the time. Nowadays this is worthless . For MONTHS have had the same issue everyone else seems to be experiencing. Get in a login loop, entirely unable to actually access or create new card numbers. Team is always "working on it" but never seem to actually accomplish anything.

Tried running the Chrome version of the extension, and get the same behavior there. This is clearly broken, and has gone unfixed for MONTHS. Just complete and utter trash.

Take some pride in your work and fix this.

This extension does not work on sites with CAPTCHA. Had to remove from my browser to use any credit card at my grocery store.

Always use ENO FIVE stars but not now. I can no longer sign in from browser since last firefox update. Put in name and password to sign in to ENO, send and it loops back to "sign in with browser". In the upper left corner of my desktop a small window opens and closes, too fast and small to note anything particular about the window. Have all permissions, cleared all cookies, no hope. Please fix.

Just called CapOne and was told they are no longer supporting ENO for firefox. SAD.

Unable to log into add-on with Firefox versions 85.0b+. The developer needs to address this before the next public release of Firefox drops.

Stopped working in Firefox. It no longer lets me log in. There's no error. It just goes back and tells me I need to log in using the browser.

Doesn't sign in anymore. No other way to make virtual card numbers. This app is a pile of garbage.

Nice while it worked, but then login stopped working - I'd log in using the popup window and it would have no effect so I could never get a number. Needs more QA, apparently.