My small business card encouraged me to use this extension however it doesn't work with small business cards. It only shows my personal cards. That makes it nearly useless to me since most of my purchases are business purchases.

Seems like a good idea.

Jan 27, 2020: Works great and easy to use.
Have used it on all the websites where I have subscriptions with no issues. Add on will autodetect a page where CC info is to be entered and launch itself to allow you to link / generate a unique CC number for that site. Websites where it has worked flawlessly: Amazon, Netflix, PayPal, NY Times, CuriosityStream, Comcast. On most of the above, the CC info auto-populated into the correct fields, and on the couple of instances where it did not, the handy "Copy" button allows you to copy / paste the info where needed, or you can enter manually if you choose. The settings cog, which leads to Capital One's VirtualCards website itself also works very well to allow you to see / manage your virtual CC numbers.

Highly recommend this addon.

Works Great!!

Errors out saying something went wrong.... I heard it works just fine on chrome but I will NOT use chrome just for this extension... You need to fix this to work right for Firefox like it did when I first got it.

This addon doesn't work. Not on FIrefox, Not on Chrome, Not on the dark, Not on a train. You try to log in and it just gives a generic error. Waste of time.

They shouldn't force you to use a browser extension for something that you should be able to easily do on the site or app, like making virtual credit card numbers. Maybe I missed another way to do it, but it seemed to force me to this extension. The extension worked ok when I tried it, but required me to go all the way to checkout on the site. If I'm not trusting a site with my credit card info, I definitely don't want to be signed into my capital one account on an extension while visiting that site. Please let us make virtual numbers without this (or apologies if it is possible, I could not figure out how to).

I would love to use the Eno feature, but every time I try, it gets as far as where I am supposed to enter my CCV # and then it quits. There is no place to enter the number, and so it becomes a huge frustration and I just have to give up and use my actual number. A real bummer.

This extension doesn't do anything. It does not allow me to go to the Capital One ENO page. Instead, it just sends me to my Firefox extensions page.

I tried to recommend the Eno credit-card-number-generator feature to my iPhone friends, but we were disappointed to discover that the iOS Capital One banking app does NOT provide this functionality. I have enjoyed using Eno on my Android phone since mid 2019 and love it. Why the delay in implementing it on iPhone?

update 8/2023
broken again, still works in Chrome

update 2/2022 I've been using eno on FF ESR, but Mozilla ended support for the version of ESR I'm running, so I tried to install eno on the current release version of FF. As others have reported, it's completely broken, even with a capital one tab open with Adblock disabled. I don't understand why the 5-star Chrome version works perfectly and the FF version periodically fails completely.

I thought I was the only one having problems with signing in until I read all the other one-star reviews. The extension worked perfectly at first. Then I had to make an out-of-town trip and I made some changes in my contact info, but I never deleted my primary SMS phone. Now neither the extension nor online banking will recognize any of my contact numbers as legit and both online banking and eno completely lock me out after a couple tries at texting to a number that has been on file unchanged for a week. Tech support told me a) wait for the numbers to propogate through the system (they never did) and b) to uninstall and reinstall the extension, which made things even worse because uninstalling wiped out all the user data stored in my Firefox profile and since the extension doesn't recognize my contact phone, it became useless. I restored my Firefox profile from a backup to regain partial access to eno functionality but as I am locked out of the system, I have to wait 24 hours to see if I can get the extension working in Chrome. Tech support claims that the problem is that I'm using my spouse's phone (same billing address, different name), but after reading all the one-star reviews with the same issue, I'm thinking they don't actually know what the problem is.

It sucks to see the bad reviews. This add-on has been wonderful for me. I have had no problems logging in, other than forgetting my password. It has been improved as far as I can tell because it has been able to detect multiple credit card accounts and let you select which one it makes virtual cards for. You can easily manage your virtual cards from the link the add-on provides.

Someone said they did not like how you could only create virtual cards from the add-on while making a purchase. I think this is a good way to restrict creating these cards so that you only do so with an explicit purpose.

Anyway, great stuff. I wish Mozilla would say why they cannot label this as a recommended extension.

When it works, it's great. Unfortunately it consistently breaks and can't log in. Get the something went wrong error. Works fine in my installed chrome based browsers.

I was loving this add on until today when I went to buy something online and I could not get past "Good news–you're ready for an update to your browser extension. All you have to do is fully quit and restart your browser, and you'll be all set to keep using virtual numbers"

No amount of restarting the browser would "update" the plugin nor did clearing cache or going into fire Fox add on to update this add on. Calling Capital One was the next step and being told there was nothing wrong on their end and to remove and reinstall the add on. I did that and it worked.

Frustrating to have to spend the time to get it to work.

Update 07-23-2024. Fire Fox & Capital One App updates have been not an issue with using this app. Love it.

Excellent source of privacy for credit card masking during online purchases and bill pay. Thank you!