SECURITY REPORT · EXTENSHI SCAN
Joshi Koukousei Captcha Service
Firefox extension·by araragi-coomtech
76
/ 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
Joshi Koukousei Captcha Service's safety score vs every other extension we've scanned
Globally
15%of extensions carry more risk
Riskier ←→ Safer
Ranked against 415,874 extensions
In Privacy & Security
15%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 12,622 privacy & security extensions
Findings
51
median 10Lower is safer
Critical findings
5
median 0Severity = Critical
Permissions
3
median 4Declared in manifest
Active users
413
median 3vs category median
Findings breakdown
Automated security signal · 51 distinct issues across 6 severities
51
distinct issues
detected
detected
Critical510%
High00%
Needs Review00%
Medium3569%
Low1122%
Info00%
Permissions requested
3 permissions declared
No risky permissions
3 permissions requested — none are flagged as risky.
Info
https://*.4chan.org/*
No additional information available.
Info
https://*.4channel.org/*
No additional information available.
Info
https://sys.4chan.org/*
No additional information available.
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Scan performed by extenshi.io · Oct 23, 2026
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