SECURITY REPORT · EXTENSHI SCAN
Simple CSS Inserter
Firefox extension·by JM
0
/ 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
Simple CSS Inserter's safety score vs every other extension we've scanned
Globally
82.52%of extensions carry more risk
Riskier ←→ Safer
Ranked across every extension we scan
In its category
72.52%of its category extensions carry more risk
Riskier ←→ Safer
Ranked within its category
Findings
8
median 38Lower is safer
Risky permissions
1
median 1Critical + high perms
Total permissions
3
median 4All declared perms
Critical findings
3
median 2Severity = Critical
Findings breakdown
Automated security signal · 8 findings across 5 severities
8
findings
detected
detected
Critical338%
High225%
Medium113%
Low225%
Info00%
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
Medium
Custom menus
Can add custom items to the browser context menu
Medium
Store local data
Can save data locally in the browser for persistence
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Scan performed by extenshi.io · Jun 25, 2026· partial run (some scanners failed)
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