Firefox Add-ons

3Versions

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Not reviewed

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88 indicators in this extension

88 indicators

0 versions analysed

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What our analysis found

GMX.com MailCheck for USA, CA, UK, FR and ES, used by 1,787 people, is not yet reviewed by Extension Auditor. It comes from a trusted publisher and was last updated in November 2023.

GMX.com MailCheck for USA, CA, UK, FR and ES Firefox extension security report

ID: gmx-com-mailcheck

Extension Info & Metadata

Status

Active

Version

6.5.5

Size

2.39 MB

Rating

3.7/5

Reviews

Users

1,787

Type

Extension

Updated

Nov 20, 2023

Publisher Contextual Analysis

Trusted

Author: 1&1 Mail & Media GmbH
Privacy: Privacy Policy
Country: DE
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Address: Elgendorfer Str. 57 Montabaur 56410 DE
Website: Visit

Extensions

Active

Obsolete

Listed

Unlisted

Users

89,035

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Screenshots & videos

Install growth

User Growth

Showing data from Sep 13, 2023 to Sep 12, 2024

Versions

+5.46%(+93 users)

Compared to 3 months ago

3 versions released in this period

Rating Count

Total: 15 ratings

Average Rating

Current: 3.80 / 5.0+0.35

See plans

React Flow

Internal permhash`da09aa7a42…`
No malicious matches

1 other extension carries this fingerprint, none of them known malicious.

Withheldnot flagged

Permhash (Mandiant)`2748aae383…`
No malicious matches

1 other extension carries this fingerprint, none of them known malicious.

Withheldnot flagged

Network indicators

88 URLs and 0 IP literals were extracted from this version.

Item	Type	Severity	Description
identity	Permission	High	This permission accesses Chrome identity service and user information. Rated High because it can obtain OAuth tokens, access connected accounts, and impersonate the user in authenticated service.
Contextual Risk Factors	Risk Factor	High	The following context increases the overall risk:• 20% increase: Access to sensitive domains increases potential impact• 10% increase: Early script execution enables pre-emptive content manipulation• 15% increase: Older manifest version lacks modern security controls
activeTab	Permission	Medium	This permission grants temporary access to the current tab. Rated Medium because it can access current page content when invoked, though limited to user-initiated actions.
tabs	Permission	Medium	This permission enables tab management and monitoring. Rated Medium because it can track open tabs, access tab metadata, and monitor user browsing patterns.
storage	Permission	Medium	This permission allows storing data locally in the browser. Rated Medium because it can persist sensitive user data, track user activities over time, and potentially store malicious payloads.
management	Permission	Medium	This permission manages other installed extensions. Rated Medium because it can enable/disable other extensions and modify their settings, with changes being visible to users.
https://.gmx.com/	Host	Medium	Host permission — access limited to this URL pattern.
Access to Sensitive Domains	Risk Factor	Medium	This extension requests access to sensitive domains: https://www.google.at/afs/ads?, https://www.google.at/afs/ads/, https://www.google.ch/afs/ads?, https://www.google.ch/afs/ads/, https://www.google.com/afs/ads?, https://www.google.com/afs/ads/, https://www.google.co.uk/afs/ads?, https://www.google.co.uk/afs/ads/, https://www.google.de/afs/ads?, https://www.google.de/afs/ads/, https://www.google.es/afs/ads?, https://www.google.es/afs/ads/, https://www.google.fr/afs/ads?, https://www.google.fr/afs/ads/, https://www.google.it/afs/ads?, https://www.google.it/afs/ads/, https://www.google.pl/afs/ads?, https://www.google.pl/afs/ads/, https://www.google.ro/afs/ads?, https://www.google.ro/afs/ads/
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.
Older Manifest Version	Risk Factor	Medium	This extension uses Manifest Version 2
notifications	Permission	Low	This permission displays system notifications. Rated Low because it can only show user-visible notifications without accessing system data.
contextMenus	Permission	Low	This permission adds items to browser context menus. Rated Medium because it only modifies right-click menus without access to page content.
search	Permission	Low	This permission accesses search functionality. Rated Low because it only interacts with the browser's search feature without accessing search history.

Sensitive Domain Access

This extension has access to the following sensitive domains:

https://www.google.at/afs/ads?*
https://www.google.at/afs/ads/*
https://www.google.ch/afs/ads?*
https://www.google.ch/afs/ads/*
https://www.google.com/afs/ads?*
https://www.google.com/afs/ads/*
https://www.google.co.uk/afs/ads?*
https://www.google.co.uk/afs/ads/*
https://www.google.de/afs/ads?*
https://www.google.de/afs/ads/*
https://www.google.es/afs/ads?*
https://www.google.es/afs/ads/*
https://www.google.fr/afs/ads?*
https://www.google.fr/afs/ads/*
https://www.google.it/afs/ads?*
https://www.google.it/afs/ads/*
https://www.google.pl/afs/ads?*
https://www.google.pl/afs/ads/*
https://www.google.ro/afs/ads?*
https://www.google.ro/afs/ads/*

88 indicators in this extension

88 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

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About this extension

The fast and secure click to your GMX International inbox.

User reviews

3.6 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

satisfait de GMX

Firefox user 13890872·17 May 2026

I can't sign in at all. Even though my gmx.com domain is signed in on the web, mailcheck refuses to sign me in. And there is no error code either.

Solomon Vandy·16 Dec 2024

Useful and functional, but could be improved with additionnal features, like the action to add a "star" to a mail. The rest of actions (read or write a mail) are just links that points to the webmail. All in all, it deserves more functionalities and a newer design.

Extension files

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URLs

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No URLs found

No IP addresses found

88 indicators in this extension

88 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

Unlock this report — $4.99 Start 7-day trial — all reports

One-time payment · Secure checkout by Stripe

Version	Size	Verdict	Findings	Permhash
6.4.0 Latest	2.38 MB	Not scanned	—	2748aae383452d53427241d597940c6257df2586a61e3cf1df0192f841ab05d2
6.5.4	2.39 MB	Not scanned	—	2748aae383452d53427241d597940c6257df2586a61e3cf1df0192f841ab05d2
6.5.5	2.39 MB	Not scanned	—	2748aae383452d53427241d597940c6257df2586a61e3cf1df0192f841ab05d2

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Code Diff

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0 changed files detected

No comparable text files found between these versions.

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Not reviewed

88 indicators in this extension

What our analysis found