Firefox Add-ons

18Versions

0Code reviewed

Not reviewed

No code review on record

We have not reviewed this extension’s code, so we cannot vouch for it either way. Check the permissions below to decide whether it asks for more than it needs.

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What our analysis found

Grammar and Spell Checker - LanguageTool, used by 337,776 people, is not yet reviewed by Extension Auditor. Its permissions mean it can read and change data on all websites and can inject scripts into pages. It comes from a trusted publisher and was last updated in July 2026.

Grammar and Spell Checker - LanguageTool Firefox extension security report

ID: languagetool

Extension Info & Metadata

Status

Active

Version

11.0.2

Size

15.06 MB

Rating

4.4/5

Reviews

5,207

Users

337,776

Type

Extension

Updated

Jul 10, 2026

Publisher Contextual Analysis

Trusted

Author: LanguageTooler GmbH
Privacy: Privacy Policy
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes

Extensions

Active

Obsolete

Listed

Unlisted

Users

3,672,042

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Screenshots & videos

Install growth

User Growth

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

Versions

-12.72%(-47,549 users)

Compared to 3 months ago

10 versions released in this period

Rating Count

Total: 4,104 ratings+8 (0%)

Average Rating

Current: 4.71 / 5.0-0.03

See plans

React Flow

Internal permhash`95293be5b2…`
1 malicious

47 other extensions carry this fingerprint; 1 of the cluster are known malicious.

Withheldmalicious
Withheldnot flagged
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+40 more

Permhash (Mandiant)`0a5e2a0b39…`
No malicious matches

11 other extensions carry this fingerprint, none of them known malicious.

Withheldnot flagged
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+4 more

Network indicators

134 URLs and 17 IP literals were extracted from this version.

Item	Type	Severity	Description
scripting	Permission	Critical	This permission allows injection and execution of JavaScript on any webpage. Rated Critical because it can modify page content, steal sensitive data, and inject malicious code into any site the extension has access to.
file:///*	Risk Factor	Critical	This permission grants access to all websites without restriction. Rated High because it can access any web content, monitor all web activity, and potentially steal sensitive data across all sites.
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• 10% increase: About:blank access enables potential sandbox escape vectors
Broad Host Permissions	Risk Factor	High	This extension has broad host permissions allowing it to access many or all websites.
Broad Content Script Access	Risk Factor	High	This extension can inject scripts into any website.
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.
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.
Access to Sensitive Domains	Risk Factor	Medium	This extension requests access to sensitive domains: ://docs.google.com/document/, ://docs.google.com/presentation/
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.
About:blank Access	Risk Factor	Medium	This extension can run content scripts in about:blank pages.
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.
alarms	Permission	Low	This permission schedules periodic tasks. Rated Low because it can only trigger events at specified times without access to sensitive data.

Sensitive Domain Access

This extension has access to the following sensitive domains:

*://docs.google.com/document/*
*://docs.google.com/presentation/*

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About this extension

With this extension you can check text with the style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.

User reviews

1.1 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

"Some features may require payment" No - ALL features may require payment but the app is intentionally vague on that. Is tried everything: created an account, chose the free version, it does not correct my spelling anymore.

Firefox user 20200632·30 Sept 2026

id rather spent 20 dollars on one month on codex or code to create this extension by myself than paying every month for check spelling LOL.

Firefox user 20137851·30 Sept 2026

It was great, but it's too expensive for me now. Time to say goodbye.

Extension files

Browse and explore files within this extension package

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URLs

134

IPv4

URLs

View the external URLs this extension communicates with to understand its network activity and data interactions.

No URLs found

No IP addresses found

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Version	Size	Verdict	Findings	Permhash
7.1.13 Latest	10.07 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.2.2	10.10 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.3.0	10.66 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.6.0	10.68 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.9.1	11.77 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.10.4	11.88 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.11.2	11.96 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.11.6	11.96 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.11.7	11.46 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d
8.11.8	11.47 MB	Not scanned	—	9176bc4644653fe2e37242f2072ebed468f800e66aef93e79c0fb61809b8340d

Showing 1 to 10 of 20 rows

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Code Diff

Compare extension code between any two versions.

0 changed files detected

No comparable text files found between these versions.

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Not reviewed

What our analysis found