SECURITY REPORT · EXTENSHI SCAN
pencil.nu
Firefox extension·by Kevin Wang
78
/ 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
pencil.nu's safety score vs every other extension we've scanned
Globally
19%of extensions carry more risk
Riskier ←→ Safer
Ranked against 415,874 extensions
In Appearance
7%of appearance extensions carry more risk
Riskier ←→ Safer
Ranked against 19,041 appearance extensions
Findings
267
median 5Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
4
median 2Declared in manifest
Active users
44
median 3vs category median
Findings breakdown
Automated security signal · 267 distinct issues across 6 severities
267
distinct issues
detected
detected
Critical10%
High00%
Needs Review00%
Medium25294%
Low145%
Info00%
Permissions requested
4 permissions declared
No risky permissions
4 permissions requested — none are flagged as risky.
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Unlimited local storage
Can store large amounts of data locally without size limits
Info
https://caesar.ent.northwestern.edu/*
No additional information available.
Info
https://www.paper.nu/*
No additional information available.
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Scan performed by extenshi.io · Oct 22, 2026
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