SECURITY REPORT · EXTENSHI SCAN
Ninja Listening Trainer
Firefox extension·by kouichicnakamura
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
Ninja Listening Trainer's safety score vs every other extension we've scanned
Globally
52%of extensions carry more risk
Riskier ←→ Safer
Ranked against 409,539 extensions
In Language Support
37%of language support extensions carry more risk
Riskier ←→ Safer
Ranked against 4,529 language support extensions
Findings
16
median 5Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
10
median 3Declared in manifest
Active users
2
median 3vs category median
Findings breakdown
Automated security signal · 16 distinct issues across 6 severities
16
distinct issues
detected
detected
Critical00%
High00%
Needs Review00%
Medium1594%
Low16%
Info00%
Permissions requested
10 permissions declared
No risky permissions
10 permissions requested — none are flagged as risky.
Medium
Store local data
Can save data locally in the browser for persistence
Info
*://*.youtube.com/*
No additional information available.
Info
file:///*.mp3
No additional information available.
Info
file:///*.m4a
No additional information available.
Info
file:///*.wav
No additional information available.
Info
file:///*.ogg
No additional information available.
Info
file:///*.oga
No additional information available.
Info
file:///*.flac
No additional information available.
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Scan performed by extenshi.io · Aug 19, 2026
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