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SECURITY REPORT · EXTENSHI SCAN

MCP Browser Kit M2

Firefox extension·by mcp-browser-kit
64
/ 100 SAFETY SCORE
RISKY
Several elevated signals. Read the findings before sharing this with your team.

Automated analysis of publicly available code — not a professional security audit. It may produce false positives and does not prove an extension is unsafe or safe. Treat it as one signal among many. Disclaimer · Report an issue

How it ranks

MCP Browser Kit M2's safety score vs every other extension we've scanned
Globally
8%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 409,539 extensions
In Other
2%of other extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 28,735 other extensions
Findings
231
median 3Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
8
median 3Declared in manifest
Active users
10
median 2vs category median

Findings breakdown

Automated security signal · 231 distinct issues across 6 severities
231
distinct issues
detected

Permissions requested

3 risky permissions of 8 total
1 critical permission require attention
This extension requests 8 permissions in total. 3 of them grant broad capabilities that are worth a careful look.
Critical
Access to all websites

Can read and modify content on every website you visit

High
View open tabs

Can see URLs and titles of all open tabs

High
Execute scripts in pages

Can inject and execute JavaScript code in web pages

Medium
Access current tab

Can temporarily access the content of the active tab when you click the extension

Medium
Store local data

Can save data locally in the browser for persistence

Medium
Monitor navigation

Can observe and track tab navigation events and URL changes

Info
*://localhost:*/*

No additional information available.

Info
*://127.0.0.1:*/*

No additional information available.

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Scan performed by extenshi.io · Aug 17, 2026
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