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SECURITY REPORT · EXTENSHI SCAN

GitHub + Mermaid

Firefox extension·by Alex Mercier
36
/ 100 SAFETY SCORE
DANGEROUS
Meaningful risk surface. Avoid on managed devices without review.

Likely abandonedsafety score reduced by 30 points

  • No update in over 7 years
Why this matters

An unmaintained extension keeps whatever flaws it shipped with, and a listing with users but no owner is an attractive target to buy and repurpose.

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

GitHub + Mermaid's safety score vs every other extension we've scanned
Globally
10%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 409,539 extensions
In Web Development
5%of web development extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 15,317 web development extensions
Findings
44
median 4Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
2
median 3Declared in manifest
Active users
277
median 2vs category median

Findings breakdown

Automated security signal · 44 distinct issues across 6 severities
44
distinct issues
detected

Permissions requested

2 permissions declared
No risky permissions
2 permissions requested — none are flagged as risky.
Info
https://github.com/*

No additional information available.

Info
https://*.github.com/*

No additional information available.

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Scan performed by extenshi.io · Aug 8, 2026
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