Eno® from Capital One® Firefox

Eno® from Capital One®

Shop more securely through your desktop browser with Eno®, your Capital One® assistant.
Eno® from Capital One®Eno® from Capital One®Eno® from Capital One®Eno® from Capital One®Eno® from Capital One®
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Features & Capabilities

Eno® from Capital One® is a browser extension designed to enhance your online shopping security. It generates unique virtual card numbers for each website, protecting your actual credit card details during checkout. This feature lets you shop confidently without exposing your real credit card number.

With Eno®, you can easily lock or unlock virtual card numbers anytime, preventing unwanted charges and giving you full control over your online spending. Even if you get a new credit card, your virtual card numbers remain active and automatically update behind the scenes. All purchases made using these virtual numbers link directly to your Capital One account, so you continue to earn rewards and benefits seamlessly.

To use Eno®, add the extension to Firefox (version 57 or later) and click the Eno icon at checkout. This tool is exclusively available to Capital One cardholders, enhancing both security and convenience in your online shopping experience.

User Growth & Download Statistics

Manifest V3 Add-on Privacy & Security Shopping
By:
Capital One
Daily users:
18,808 -244
Rating:
3.03
(726)
Version:
5.5.1 Last updated: 2025-11-13
Version code:
6069871
Creation date:
2018-02-23
Risk:
High risk impact Moderate risk likelihood
Permissions:
Host permissions:
  • https://*/*
  • http://*/*
Content scripts matches:
  • *
  • *.capitalone.com
Size:
5.38MB
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-07-11
Compare stats and ranking:

Ranking

# 523 ▼ 4
Other rankings
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Other platforms

Chrome
Eno® from Capital One® (v5.5.0)
600,000 4.56 (6,682)
Edge
Eno® from Capital One® (v5.5.0)
38,606 2.50 (93)

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.
Developed by:
Capital One
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/capital-one-eno/
Website:
https://www.capitalone.com/applications/eno/virtualnumbers/help/

Permission Change History

2025-08-05: Version 4.4.0 → 5.3.4
Add Host permissions: https://*/* http://*/*
Remove Permissions: webRequest webRequestBlocking https://*.capitalone.com/* http://*.capitalone.com/*
Add Optional permissions: <all_urls>
2023-09-12: Version 4.1.8 → 4.1.12
Add Permissions: alarms
2022-07-19: Version 3.2.3 → 4.1.0
Add Permissions: https://*.capitalone.com/* http://*.capitalone.com/*
Remove Permissions: alarms https://*/ http://*/

User Reviews

User reviews praise Eno for offering per-merchant virtual cards and added security, with occasional convenience when it works. However, widespread reliability problems dominate feedback: frequent loading failures, login/verification hurdles, and the need to manually copy-paste numbers. Additional issues include UI glitches, persistent freezes, and a lack of updates, all of which undermine the experience. Overall, the feature set is compelling but the extension is inconsistent and often a hassle to use.
Pros
  • Per-merchant virtual card numbers: allows a unique virtual card for each merchant.
  • Enhanced security: using virtual numbers helps protect your personal card data.
  • Convenience when it works: can generate a number on Capital One and paste it into the merchant site.
Cons
  • Unreliable performance: works only sometimes and often stalls, fails to load, or never loads.
  • Login/verification problems: frequent login issues and mobile number verification blockers.
  • No auto-fill: requires manual copy-paste of the generated card instead of auto-populating the checkout form.
  • UI/stability issues: janky behavior, freezing, and missing UI elements (e.g., icon).
  • Maintenance concerns: not updated for a long period, raising questions about security and reliability.
Recent reviews
Eno used to be really good, but no matter how many times I've uninstalled and reinstalled it over the last year, it almost never works. The extension disregards my request to stay logged in, so every time I try to use it, I need to log in, and then the window just hangs forever on 'checking session.' Just to damage my own sanity, I've left windows open for 30+ minutes, and still, it never logs in. Kind of amazing, honestly.
by Fi*****, 2026-06-21
THIS ENO APP FROM CAPITAL ONE REQUIRES ME TO ALLOW THEM TO SEE EVERY WEBSITE I VISIT. I don't want to give that much of my personal data no matter what, and especially to give it to them for free.
by Fi*****, 2026-06-19
It works nearly everywhere I have used it, and the copy/paste works on sites where it doesn't work automatically. I moved to Capital One to get virtual cards, and I didn't know how easy it would be to use.
by Fi*****, 2026-06-10
View all user reviews ›

Is Eno® from Capital One® Safe?

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Eno® from Capital One® requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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  • High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
  • Low ******* ****** ** *** ********* ******** **************
Risk likelihood
Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Eno® from Capital One® is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details
  • Medium This extension has medium user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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