SECURITY REPORT · EXTENSHI SCAN
MCP Browser Kit M2
Firefox extension·by mcp-browser-kit
0
/ 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
Riskier ←→ Safer
Ranked against 369,936 extensions
In Other
2%of other extensions carry more risk
Riskier ←→ Safer
Ranked against 26,888 other extensions
Findings
231
median 3Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
8
median 3Declared in manifest
Active users
4
median 2vs category median
Findings breakdown
Automated security signal · 231 distinct issues across 6 severities
231
distinct issues
detected
detected
Critical31%
High21%
Needs Review00%
Medium3314%
Low19384%
Info00%
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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