SECURITY REPORT · EXTENSHI SCAN
Header Master
Firefox extension·by varg
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
Header Master's safety score vs every other extension we've scanned
Globally
27%of extensions carry more risk
Riskier ←→ Safer
Ranked against 402,581 extensions
In Web Development
15%of web development extensions carry more risk
Riskier ←→ Safer
Ranked against 15,264 web development extensions
Findings
20
median 4Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
3
median 3Declared in manifest
Active users
0
median 2vs category median
Findings breakdown
Automated security signal · 20 distinct issues across 6 severities
20
distinct issues
detected
detected
Critical15%
High210%
Needs Review00%
Medium1680%
Low15%
Info00%
Permissions requested
3 permissions declared
No risky permissions
3 permissions requested — none are flagged as risky.
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Block requests with host access
Can block or redirect network requests and requires host permissions
Low
Block network requests (declarative)
Can block or redirect network requests using predefined rules without seeing content
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Scan performed by extenshi.io · Aug 10, 2026
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