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SECURITY REPORT · EXTENSHI SCAN

MCP Browser Controller

Firefox extension·by sl4x0
63
/ 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
This extension
Riskier ←→ Safer
Ranked against 409,539 extensions
In Web Development
3%of web development extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 15,317 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 2vs category median

Findings breakdown

Automated security signal · 32 distinct issues across 6 severities
32
distinct issues
detected

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 · Oct 15, 2026
Browser extensions made transparent.