Eno® from Capital One®

Name: Eno® from Capital One®
Rating: 3.0275 (727 reviews)
Author: Capital One

By: Capital One Add-on

Shop more securely through your desktop browser with Eno®, your Capital One® assistant.

Overview

Firefox Add-ons Store

Daily users

18,616 ▼ 97

Data as of 2026-08-01

Rating:

3.03

(727)

Version:

5.5.1

Last updated: 2025-11-13

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

Add-on Privacy & Security Shopping

By:

Daily users:

Rating:

Version:

5.5.1 Last updated: 2025-11-13

Version code:

6069871

Creation date:

2018-02-23

Risk:

Permissions:

Host permissions:

https://*/*
http://*/*

Content scripts matches:

*
*.capitalone.com

Size:

5.38MB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-08-01

Compare stats and ranking:

Ranking

# 523 ▼ 2

Other rankings

#16 in Shopping ▲ 1

#126 in Privacy & Security ▲ 1

#26 in benefit keyword 10

#70 in rewards keyword 44 ▼ 1

#70 in shopping keyword 65

Upgrade to see more rankings

Other platforms

Eno® from Capital One® (v6.0.0)

600,000 4.56

(6,684)

Eno® from Capital One® (v6.0.0)

39,175 2.50

(93)

For Developers

Monetize with App Pass Boost with Extension Booster

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

Garbage. Asks to login, then doesn't login. Is this even legit from Capital One or is it something that is just harvesting credentials?

by Ka*****, 2026-07-17

Constantly freezes on "Checking session" or "Looking for virtual cards" and needs pages to be refreshed upwards of 10 times to use a card. Truly a horrible app.

by Fi*****, 2026-07-11

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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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® has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

Medium This extension has medium user count. Unpopular extensions may not be stable or safe.
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