SECURITY REPORT · EXTENSHI SCAN
QuietCSS
Firefox extension·by TomMakes
86
/ 100 SAFETY SCORE
EXCELLENT
Looks clean. No meaningful risks detected in this scan.
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
QuietCSS's safety score vs every other extension we've scanned
Globally
56%of extensions carry more risk
Riskier ←→ Safer
Ranked against 397,522 extensions
In Appearance
23%of appearance extensions carry more risk
Riskier ←→ Safer
Ranked against 18,889 appearance extensions
Findings
11
median 3Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
5
median 2Declared in manifest
Active users
1
median 3vs category median
Findings breakdown
Automated security signal · 11 distinct issues across 6 severities
11
distinct issues
detected
detected
Critical00%
High19%
Needs Review00%
Medium873%
Low19%
Info19%
Permissions requested
3 risky permissions of 5 total
1 critical permission require attention
This extension requests 5 permissions in total. 3 of them grant broad capabilities that are worth a careful look.
Critical
Access to all websites
Can read and modify content on every website you visit
High
Execute scripts in pages
Can inject and execute JavaScript code in web pages
High
View open tabs
Can see URLs and titles of all open tabs
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Access current tab
Can temporarily access the content of the active tab when you click the extension
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Scan performed by extenshi.io · Aug 24, 2026
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