# GMX MailCheck for Firefox

> Mail notifier for multiple email accounts

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

## Overview

- **ID:** `gmx-mailcheck`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** 1&1 Mail & Media GmbH
- **Category:** appearance,alerts-updates
- **Daily users:** 17,383
- **Weekly downloads:** 223
- **Rating:** 2.84 / 5 (141 ratings)
- **Version:** 8.0.20
- **Last updated:** 2026-06-25
- **First published:** 2010-09-17
- **Size:** 2.36 MB
- **Data as of:** 2026-09-15
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/gmx-mailcheck/)
- **Website:** [http://meinungen.gmx.net/forum-gmx/post/2231008?sp=140](http://meinungen.gmx.net/forum-gmx/post/2231008?sp=140)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/gmx-mailcheck/privacy/](https://addons.mozilla.org/firefox/addon/gmx-mailcheck/privacy/)

## Description

GMX MailCheck for Firefox is a convenient mail notifier designed to streamline your email experience. It provides real-time email notifications right in the browser and on your desktop, ensuring you never miss an important message. With just one click, users can read and write emails efficiently without switching between tabs.

This extension supports multiple email accounts from various providers including GMX, WEB.DE, 1&1, mail.com, and more, all accessible through a single tool. It prioritizes your security by utilizing encrypted SSL connections and password protection adhering to the highest security standards, making your email management safe and hassle-free.

## Rankings

- #555 — Overall
- #16 — Alerts & Updates
- #87 — Appearance
- #11 — mail
- #27 — browser tab
- #33 — password-protected

## Permissions and access

### Permissions

- `activeTab`
- `tabs`
- `storage`
- `management`
- `notifications`
- `contextMenus`
- `identity`
- `search`
- `https://*.gmx.net/*`

### Content script matches

- `*.web.de`
- `*.gmx.net`
- `*.gmx.de`
- `*.gmx.ch`
- `*.gmx.at`
- `*.gmx.com`
- `*.mail.com`
- `*.1und1.de`
- `*.1and1.com`
- `suche.gmx.net`
- `suche.gmx.at`
- `suche.gmx.ch`
- `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:** High 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 website URL may be invalid

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

## Review summary

Users praise the add-on’s core mail-checking reliability and simple unread notifications after years of use. Multiple reviewers complain recent updates are intrusive: forcing GMX search/homepage and opening tabs, requiring excessive permissions, and causing login or UI regressions with poor update transparency.

### Pros

- Reliable long-term mail checking — many users report years of stable use and correct unread-count notifications
- Simple, effective mail program — several reviews call it "super" or "sehr gutes mail prog"
- Does what users expect: notifies about new mail (unread count)

### Cons

- Adds intrusive GMX features without consent (sets GMX as default search and/or start page, opens GMX search tab at startup)
- Persistent GMX tab and search/homepage changes that users report they cannot remove
- Requests excessive permissions and is seen as overly invasive
- Updates have caused regressions: login failures, UI changes (text size/bold), crashes and no easy rollback or changelog

## Similar extensions and apps

- [WEB.DE MailCheck for Firefox](https://chrome-stats.com/d/webde-mailcheck) — 21,592 users, 3.03 / 5
- [mail.com MailCheck](https://chrome-stats.com/d/mailcom-mailcheck) — 1,201 users, 2.70 / 5
- [GMX.com MailCheck for USA, CA, UK, FR and ES](https://chrome-stats.com/d/gmx-com-mailcheck) — 1,814 users, 3.71 / 5
- [GMX Mail Checker](https://chrome-stats.com/d/gmx-mail-checker) — 19 users
- [Email Notifier](https://chrome-stats.com/d/email-notifier) — 363 users, 3.37 / 5
- [X-notifier (for Gmail,Hotmail,Yahoo,AOL ...)](https://chrome-stats.com/d/xnotifier) — 6,071 users, 2.89 / 5
- [GMX Email Notifier](https://chrome-stats.com/d/gmx-email-notifier) — 1 users
- [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
- [Geething](https://chrome-stats.com/d/geething) — 1 users
- [AI MailAssist for Gmail](https://chrome-stats.com/d/mailassist)
- [Gmail™ Notifier +](https://chrome-stats.com/d/fastest-notifier-for-gmail) — 846 users, 3.16 / 5

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