SECURITY REPORT · EXTENSHI SCAN
MARC21 Viewer
Chrome extension·by bibliotekarien.se
84
/ 100 SAFETY SCORE
CAUTION
Mostly fine, but a few things worth reviewing before you install.
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
MARC21 Viewer's safety score vs every other extension we've scanned
Globally
39%of extensions carry more risk
Riskier ←→ Safer
Ranked against 421,529 extensions
In Productivity
46%of productivity extensions carry more risk
Riskier ←→ Safer
Ranked against 206,551 productivity extensions
Findings
8
median 18Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
2
median 3Declared in manifest
Active users
101
median 13vs category median
Findings breakdown
Automated security signal · 8 distinct issues across 6 severities
8
distinct issues
detected
detected
Critical113%
High00%
Needs Review00%
Medium563%
Low225%
Info00%
Permissions requested
2 permissions declared
No risky permissions
2 permissions requested — none are flagged as risky.
Medium
Add context menu items
Can add custom items to the right-click context menu
Medium
Store local data
Can save data locally in the browser for persistence
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Scan performed by extenshi.io · Oct 26, 2026
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