I installed it 2 months ago (didn't have to disable/remove any of my plugins or extensions or pop-up blockers, I just searched for Eno in Firefox add-ons & installed on Windows 8.1 w/ Firefox 72.x, later Firefox auto updated to 73.x, 74.0 w/ no problems to virtual card# use) - easy install, no need to restart Firefox or laptop. It's worked great for me since then on many online retail sites. When using for the 1st time on a new retail site, it requires 2 factor authentication w/ your cell, after that it'll save & reuse the newly assigned virtual card# for that site (it also auto fills in the payment form). Each site gets it's own different virtual #. You only have to type in your name on the payment form.

to eveyone that cant get it to work. 1) remove any popup blocker. 2) drag and drop virtual cc # onto wherever you are putting the virtual number. 3) i did the later and then rebooted my computer

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!!

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?

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.

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!