WEB.DE MailCheck for Firefox

Name: WEB.DE MailCheck for Firefox
Rating: 3.0394 (127 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

WEB.DE MailCheck for Firefox is a powerful mail notifier extension that keeps you updated on all your email accounts directly within your browser. With support for popular services like WEB.DE, GMX, 1&1, mail.com, and many more, it consolidates your emails in one convenient tool. The extension features browser and desktop notifications, allowing you to read and write emails with just one click. It ensures your privacy and security through encrypted SSL connections and password protection. Additionally, users can optionally access their emails through a mail icon on the start page for seamless email management.

User Growth & Download Statistics

Add-on Communication Privacy & Security

By:

1&1 Mail & Media GmbH

Daily users:

22,048 399

Rating:

3.04

(127)

Version:

8.0.18 Last updated: 2025-12-03

Version code:

6084717

Creation date:

2012-05-21

Risk:

Permissions:

Content scripts matches:

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

Size:

2.61MB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-23

Compare stats and ranking:

Ranking

# 473 ▲ 9

Other rankings

#12 in Alerts & Updates

#76 in Appearance ▲ 1

#5 in mail keyword 53

#13 in hotmail keyword 6 ▲ 1

#29 in web3 keyword 39

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Other platforms

WEB.DE Mail & Cloud (v9.9.2)

20,976,060 4.27

(668,427)

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/webde-mailcheck/

Website:

https://hilfe.web.de/mailcheck/firefox.html

User Reviews

Reviews are mixed: several users like the quick mail-count overview and report satisfactory performance, including multi-address usage. However, many encounter reliability and compatibility issues on Firefox (and sometimes installation), domain/address limitations, unwanted search engine changes after updates, and account-adding problems. Usefulness depends on browser version and email domain.

Pros

Provides a quick overview by showing how many emails have arrived for each address
Some users report it works well and are satisfied with the functionality
Supports multiple addresses; at least two addresses work without issues

Cons

Stability and compatibility issues with Firefox: some users report it does not work or is marked as unsupported
Cannot install on Windows 11 with the latest Firefox
Domain/address limitations: 1und1 endings are not supported, and adding new addresses can fail
Updates can inject the Web.de search engine into Firefox, raising privacy/opt-in concerns
Cannot add additional accounts beyond existing ones; 'Konto hinzufügen' sometimes does nothing

Recent reviews

Es funktioniert einfach nicht. Habe es heute zum ersten Mal installiert und bekomme kein Symbol davon angezeigt, habe auch genau nachgeschaut in der Symbolleiste.

by Fi*****, 2026-02-06

by Fi*****, 2025-03-23

by 天灭*****, 2025-02-15

View all user reviews ›

Is WEB.DE MailCheck for Firefox 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.

WEB.DE MailCheck for Firefox 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.

WEB.DE MailCheck for Firefox 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.
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