SECURITY REPORT · EXTENSHI SCAN
AtCoder In-Browser Playground
Firefox extension·by 綾坂こと
43
/ 100 SAFETY SCORE
RISKY
Several elevated signals. Read the findings before sharing this with your team.
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 402,632 extensions
In Appearance
0%of appearance extensions carry more risk
Riskier ←→ Safer
Ranked against 18,905 appearance extensions
Findings
206
median 3Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
2
median 2Declared in manifest
Active users
1
median 3vs category median
Findings breakdown
Automated security signal · 206 distinct issues across 6 severities
206
distinct issues
detected
detected
Scanners reported 527 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical10%
High115%
Needs Review00%
Medium15073%
Low3919%
Info52%
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 · Jul 25, 2026
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