SECURITY REPORT · EXTENSHI SCAN
Kimetsu to Oumu
Firefox extension·by Yu Shimura
0
/ 100 SAFETY SCORE
CAUTION
Mostly fine, but a few things worth reviewing before you install.
Likely abandonedsafety score reduced by 30 points
- No update in over 5 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
Kimetsu to Oumu's safety score vs every other extension we've scanned
Globally
82%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Appearance
56%of appearance extensions carry more risk
Riskier ←→ Safer
Ranked against 17,915 appearance extensions
Findings
3
median 3Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
2
median 2Declared in manifest
Active users
0
median 3vs category median
Findings breakdown
Automated security signal · 3 distinct issues across 6 severities
3
distinct issues
detected
detected
Critical00%
High00%
Needs Review00%
Medium133%
Low267%
Info00%
Permissions requested
2 risky permissions of 2 total
2 high-risk permissions require attention
This extension requests 2 permissions in total. 2 of them grant broad capabilities that are worth a careful look.
High
Access all HTTP sites
Can read and modify content on all non-encrypted websites
High
Access all HTTPS sites
Can read and modify content on all encrypted websites
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Scan performed by extenshi.io · Aug 14, 2026
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