mail.com MailCheck

Name: mail.com MailCheck
Rating: 2.7125 (80 reviews)
Author: 1&1 Mail & Media GmbH

By: 1&1 Mail & Media GmbH

Mail notifier for multiple email accounts.

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Install

Features & Capabilities

mail.com MailCheck is a powerful Chrome extension that acts as a mail notifier for your multiple email accounts. It delivers email notifications directly in your browser and on your desktop, ensuring you never miss important messages.

With just one click, you can read and write emails seamlessly within a single tool. It supports popular email providers such as mail.com, GMX, and WEB.DE, and now includes notifications for new and unread emails in your Gmail and Outlook accounts. Security is a top priority, featuring encrypted SSL connections and robust password protection to keep your information safe.

User Growth & Download Statistics

Add-on Communication Privacy & Security

By:

1&1 Mail & Media GmbH

Daily users:

1,143 -21

Rating:

2.71

(80)

Version:

8.0.18 Last updated: 2025-12-10

Version code:

6090543

Creation date:

2012-12-03

Risk:

Permissions:

Content scripts matches:

*.web.de
*.gmx.net
*.gmx.de
*.gmx.ch
*.gmx.at
*.gmx.com
*.mail.com
*.1und1.de
*.1and1.com
search.mail.com

Size:

2.58MB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-23

Compare stats and ranking:

Ranking

# 3,020 ▼ 22

Other rankings

#76 in Alerts & Updates

#14 in mail keyword 53

#50 in email keyword 67 ▲ 1

#56 in password-protected keyword 53

#57 in hotmail keyword 6

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Other platforms

mail.com MailCheck (v8.0.6)

30,000 4.04

(438)

mail.com MailCheck (v6.5.5)

18,516 3.80

(36)

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:

1&1 Mail & Media GmbH

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/mailcom-mailcheck/

Website:

https://support.mail.com/mailcheck/

User Reviews

Recurring issues across reviews show the Firefox version of mail.com MailCheck is unreliable: many users cannot log in, experience Firefox-specific compatibility problems, and cannot add accounts, with some privacy concerns raised about data telemetry. The lack of consistent developer support is also noted.

Pros

Cons

Frequent login failures on Firefox: login button inactive or sign-in process hangs.
Firefox compatibility issues: reports that the extension works in Chrome but not in Firefox, with compatibility warnings.
Account setup flow is broken in Firefox: users cannot add new accounts and password input may be missing or blocked.
Privacy concerns: reports of telemetry and data collection/sharing.

Recent reviews

Doesn't work. Initial login/setup on desktop Firefox doesn't work. Error in browser console when trying submit email for login: "Uncaught Error: error_permission" at onboarding-panel.js:9330:99

by Co*****, 2025-11-17

Extension works good for me once you set It up It will appear to not work but If you click on the mail.com extension It will show your account & you have the option to set up another.

by Au*****, 2025-09-21

Doesn't work anymore, can't login.

by Mr*****, 2025-09-04

View all user reviews ›

Is mail.com MailCheck 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.

mail.com MailCheck requires a lot of sensitive permissions. 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.

mail.com MailCheck may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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