SECURITY REPORT · EXTENSHI SCAN
AtCoder In-Browser Playground
Firefox extension·by 綾坂こと
0
/ 100 SAFETY SCORE
DANGEROUS
Meaningful risk surface. Avoid on managed devices without review.
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
AtCoder In-Browser Playground's safety score vs every other extension we've scanned
Globally
1%of extensions carry more risk
Riskier ←→ Safer
Ranked against 120,712 extensions
In Appearance
0%of appearance extensions carry more risk
Riskier ←→ Safer
Ranked against 21,272 appearance extensions
Findings
536
median 3Lower is safer
Critical findings
2
median 0Severity = Critical
Permissions
2
median 3Declared in manifest
Active users
3
median 4vs category median
Findings breakdown
Automated security signal · 536 findings across 5 severities
536
findings
detected
detected
1 square ≈ 2 findings
Critical20%
High8616%
Medium41076%
Low326%
Info61%
Permissions requested
2 permissions declared
No risky permissions
2 permissions requested — none are flagged as risky.
Medium
Store local data
Can save data locally in the browser for persistence
Info
https://atcoder.jp/contests/*/tasks/*
No additional information available.
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Scan performed by extenshi.io · Jun 25, 2026
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