Firefox Add-ons
7Versions
0Code reviewed

Not reviewed

No code review on record

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127 indicators in this extension

127 indicators
0 versions analysed

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What our analysis found

GMX MailCheck for Firefox, used by 17,387 people, is not yet reviewed by Extension Auditor. It comes from a trusted publisher and was last updated in June 2026.

GMX MailCheck for Firefox

GMX MailCheck for Firefox Firefox extension security report

ID: gmx-mailcheck

Extension Info & Metadata

Status
Active
Version
8.0.20
Size
2.36 MB
Rating
2.8/5
Reviews
141
Users
17,387
Type
Extension
Updated
Jun 25, 2026
Category
N/A
Price
Free
Featured
No
Visibility
Listed
Mature
No
By Google
No
Trusted
No
This publisherTrack record
34extensions
All still listed

Publisher Contextual Analysis

Trusted
Author
1&1 Mail & Media GmbH
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
34
Active
17
Obsolete
0
Listed
34
Unlisted
0
Users
89,035

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Screenshots & videos

Screenshot 1
Screenshot 2

Install growth

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:• 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.net/*
Host
Medium
Host permission — access limited to this URL pattern.
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.

127 indicators in this extension

127 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

Mail notifier for multiple email accounts

User reviews

Extension files

Browse and explore files within this extension package

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URLs
127

URLs

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No URLs found
No IP addresses found

127 indicators in this extension

127 indicators
0 versions analysed

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

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Version
Size
Verdict
Findings
Permhash
6.4.0
Latest
2.38 MBNot scanned—
206e0ec7522fd2f4f011601d82503f1f900e5d62aa41f8afd2012a2f96b83e58
6.5.4
2.39 MBNot scanned—
206e0ec7522fd2f4f011601d82503f1f900e5d62aa41f8afd2012a2f96b83e58
6.5.5
2.39 MBNot scanned—
206e0ec7522fd2f4f011601d82503f1f900e5d62aa41f8afd2012a2f96b83e58
6.2.3
2.34 MBNot scanned—
206e0ec7522fd2f4f011601d82503f1f900e5d62aa41f8afd2012a2f96b83e58
8.0.17
2.42 MBNot scanned—
206e0ec7522fd2f4f011601d82503f1f900e5d62aa41f8afd2012a2f96b83e58
8.0.18
2.66 MBNot scanned—
206e0ec7522fd2f4f011601d82503f1f900e5d62aa41f8afd2012a2f96b83e58
8.0.20
2.36 MBNot scanned—
206e0ec7522fd2f4f011601d82503f1f900e5d62aa41f8afd2012a2f96b83e58
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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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