SECURITY REPORT · EXTENSHI SCAN
MCP Browser Controller
Firefox extension·by sl4x0
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 Controller's safety score vs every other extension we've scanned
Globally
7%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Web Development
3%of web development extensions carry more risk
Riskier ←→ Safer
Ranked against 14,329 web development extensions
Findings
32
median 4Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
12
median 3Declared in manifest
Active users
1
median 3vs category median
Findings breakdown
Automated security signal · 32 distinct issues across 6 severities
32
distinct issues
detected
detected
Critical39%
High1134%
Needs Review00%
Medium1547%
Low39%
Info00%
Permissions requested
9 risky permissions of 12 total
3 critical permissions require attention
This extension requests 12 permissions in total. 9 of them grant broad capabilities that are worth a careful look.
Critical
Manage other extensions
Can enable, disable, or uninstall other browser extensions
Critical
Communicate with desktop apps
Can exchange messages with applications installed on your computer
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
Access browser cookies
Can read and modify cookies, potentially accessing login sessions
High
Control privacy settings
Can modify browser privacy settings like Do Not Track and safe browsing
Medium
Browser settings
Can read and modify browser-wide settings
Medium
Access bookmarks
Can read and modify your saved bookmarks
Low
Schedule tasks
Can schedule periodic background tasks
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Scan performed by extenshi.io · Aug 16, 2026
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