extenshi.io
SECURITY REPORT · EXTENSHI SCAN

Client Challenge

Firefox extension·by イスターリャ
62
/ 100 SAFETY SCORE
RISKY
Several elevated signals. Read the findings before sharing this with your team.

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

Client Challenge's safety score vs every other extension we've scanned
Globally
67%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 397,240 extensions
In Games Entertainment
37%of games entertainment extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 9,435 games entertainment extensions
Findings
7
median 4Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
5
median 3Declared in manifest
Active users
1
median 4vs category median

Findings breakdown

Automated security signal · 7 distinct issues across 6 severities
7
distinct issues
detected

Permissions requested

1 risky permission of 5 total
1 high-risk permission require attention
This extension requests 5 permissions in total. 1 of them grant broad capabilities that are worth a careful look.
High
View open tabs

Can see URLs and titles of all open tabs

Info
*://live.nicovideo.jp/watch/*

No additional information available.

Info
*://live2.nicovideo.jp/watch/*

No additional information available.

Info
*://www.nicovideo.jp/watch/*

No additional information available.

Info
*://commons.nicovideo.jp/tree/edit/*

No additional information available.

Are you the author of Client Challenge?

Claim this extension to respond to findings, add context, and earn a verified badge on extenshi.io.

Claim this extension

Add the badge to your README

Show Client Challenge's live security score on GitHub or in your docs
Extenshi security score badge preview
Markdown
[![Extenshi security score](https://catalog.extenshi.io/api/badge/118986)](https://catalog.extenshi.io/extensions/118986/security)
HTML
<a href="https://catalog.extenshi.io/extensions/118986/security"><img src="https://catalog.extenshi.io/api/badge/118986" alt="Extenshi security score" /></a>

The badge always shows the current score — it updates automatically after every scan.

Scan performed by extenshi.io · Aug 25, 2026
Browser extensions made transparent.