# WEB.DE MailCheck for Firefox

> Mail notifier for multiple email accounts

Canonical page: [https://chrome-stats.com/d/webde-mailcheck](https://chrome-stats.com/d/webde-mailcheck)

## Overview

- **ID:** `webde-mailcheck`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** 1&1 Mail & Media GmbH
- **Category:** appearance,alerts-updates
- **Daily users:** 22,181
- **Weekly downloads:** 254
- **Rating:** 3.03 / 5 (128 ratings)
- **Version:** 8.0.20
- **Last updated:** 2026-06-25
- **First published:** 2012-05-21
- **Size:** 2.31 MB
- **Data as of:** 2026-09-13
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/webde-mailcheck/)
- **Website:** [https://hilfe.web.de/mailcheck/firefox.html](https://hilfe.web.de/mailcheck/firefox.html)

## Description

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.

## Rankings

- #487 — Overall
- #13 — Alerts & Updates
- #78 — Appearance
- #5 — mail
- #12 — hotmail
- #31 — web3

## Permissions and access

### Permissions

- `activeTab`
- `tabs`
- `storage`
- `management`
- `notifications`
- `contextMenus`
- `identity`
- `search`
- `https://*.web.de/*`

### Content script matches

- `*.web.de`
- `*.gmx.net`
- `*.gmx.de`
- `*.gmx.ch`
- `*.gmx.at`
- `*.gmx.com`
- `*.mail.com`
- `*.1und1.de`
- `*.1and1.com`
- `suche.web.de`
- `dl.web.de`
- `dl.gmx.net`
- `dl.gmx.com`
- `dl.mail.com`
- `dl.1und1.de`
- `www.adsensecustomsearchads.com`
- `1und1.de`
- `www.1und1.de`
- `gmx.net`
- `www.gmx.net`
- `gmx.com`
- `www.gmx.com`
- `mail.com`
- `www.mail.com`
- `web.de`
- `www.web.de`
- `login.live.com`

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was updated in the past 3 months. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

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

## Similar extensions and apps

- [GMX MailCheck for Firefox](https://chrome-stats.com/d/gmx-mailcheck) — 17,865 users, 2.84 / 5
- [mail.com MailCheck](https://chrome-stats.com/d/mailcom-mailcheck) — 1,231 users, 2.70 / 5
- [GMX.com MailCheck for USA, CA, UK, FR and ES](https://chrome-stats.com/d/gmx-com-mailcheck) — 1,853 users, 3.71 / 5
- [Email Notifier](https://chrome-stats.com/d/email-notifier) — 370 users, 3.37 / 5
- [X-notifier (for Gmail,Hotmail,Yahoo,AOL ...)](https://chrome-stats.com/d/xnotifier) — 6,245 users, 2.89 / 5
- [Mail Checker for Proton Mail](https://chrome-stats.com/d/mail-checker-for-proton-mail) — 12 users, 5.00 / 5
- [1&1 MailCheck](https://chrome-stats.com/d/1und1-mailcheck) — 802 users, 1.67 / 5
- [Checker Mail.ru](https://chrome-stats.com/d/checker-mail-ru) — 72 users, 5.00 / 5
- [GMX Mail Checker](https://chrome-stats.com/d/gmx-mail-checker) — 20 users
- [Yandex Mail Watcher](https://chrome-stats.com/d/yandex-mail-watcher) — 38 users, 4.71 / 5
- [AI MailAssist for Gmail](https://chrome-stats.com/d/mailassist)
- [Geething](https://chrome-stats.com/d/geething) — 1 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/webde-mailcheck)