SECURITY REPORT · EXTENSHI SCAN
Client Challenge
Firefox extension·by Tony Rosler
76
/ 100 SAFETY SCORE
CAUTION
Mostly fine, but a few things worth reviewing before you install.
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
27%of extensions carry more risk
Riskier ←→ Safer
Ranked against 397,522 extensions
In Social & Communication
13%of social & communication extensions carry more risk
Riskier ←→ Safer
Ranked against 13,634 social & communication extensions
Findings
38
median 5Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
8
median 3Declared in manifest
Active users
2
median 3vs category median
Findings breakdown
Automated security signal · 38 distinct issues across 6 severities
38
distinct issues
detected
detected
Scanners reported 81 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical00%
High25%
Needs Review00%
Medium1847%
Low13%
Info1745%
Permissions requested
8 permissions declared
No risky permissions
8 permissions requested — none are flagged as risky.
Medium
Monitor navigation
Can observe and track tab navigation events and URL changes
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Unlimited local storage
Can store large amounts of data locally without size limits
Info
https://fantasy.premierleague.com/*
No additional information available.
Info
https://fantasy.premierleague.com/entry/*
No additional information available.
Info
https://fantasy.premierleague.com/my-team
No additional information available.
Info
https://fantasy.premierleague.com/transfers
No additional information available.
Info
https://fantasy.premierleague.com/leagues/*
No additional information available.
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Scan performed by extenshi.io · Aug 18, 2026
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