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SECURITY REPORT · EXTENSHI SCAN

Awesome NicoNico Downloader

Chrome extension·by https://pbion.com
39
/ 100 SAFETY SCORE
DANGEROUS
Meaningful risk surface. Avoid on managed devices without review.

Likely abandonedsafety score reduced by 30 points

  • No update in over 6 years
  • Bundles libraries with known vulnerabilities and no fix in sight
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

Awesome NicoNico Downloader's safety score vs every other extension we've scanned
Globally
14%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 409,539 extensions
In Photos Music Videos
5%of photos music videos extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 11,181 photos music videos extensions
Findings
59
median 4Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
3
median 3Declared in manifest
Active users
9000
median 6vs category median

Findings breakdown

Automated security signal · 59 distinct issues across 6 severities
59
distinct issues
detected
Scanners reported 65 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.

Permissions requested

1 risky permission of 3 total
1 high-risk permission require attention
This extension requests 3 permissions in total. 1 of them grant broad capabilities that are worth a careful look.
High
Execute scripts in pages

Can inject and execute JavaScript code in web pages

Low
Block network requests (declarative)

Can block or redirect network requests using predefined rules without seeing content

Low
View blocked request stats

Can see which declarative rules matched network requests

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Scan performed by extenshi.io · Jul 25, 2026
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