GMX MailCheck for Firefox

Name: GMX MailCheck for Firefox
Rating: 2.844 (141 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

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.

User Growth & Download Statistics

Add-on Communication Privacy & Security

By:

1&1 Mail & Media GmbH

Daily users:

17,674 283

Rating:

2.84

(141) 0.01

Version:

8.0.18 Last updated: 2025-12-03

Version code:

6084714

Creation date:

2010-09-17

Risk:

Permissions:

Content scripts matches:

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

Size:

2.66MB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-23

Compare stats and ranking:

Ranking

# 539 ▲ 9

Other rankings

#15 in Alerts & Updates

#81 in Appearance

#11 in mail keyword 53

#26 in browser tab keyword 74

#33 in password-protected keyword 53 ▲ 3

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Other platforms

GMX MailCheck (v8.0.6)

100,000 3.17

(454)

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/gmx-mailcheck/

Website:

http://meinungen.gmx.net/forum-gmx/post/2231008?sp=140

User Reviews

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

Recent reviews

Stopped working a year ago. Can't log in. Button goes grey after entering email.

by Pr*****, 2026-06-22

Einmal installiert wird man es nicht mehr los, es kommt einfach immer wieder. Außerdem ändert es alle mögliche Einstellungen.

by Ps*****, 2025-08-14

super

by Fi*****, 2025-07-24

View all user reviews ›

Is GMX 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.

GMX 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.

GMX MailCheck for Firefox may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood analysis details

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