extenshi.io
SECURITY REPORT · EXTENSHI SCAN

Header Tool

Firefox extension·by loreii
67
/ 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 Tool's safety score vs every other extension we've scanned
Globally
10%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 409,539 extensions
In Web Development
5%of web development extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 15,317 web development extensions
Findings
21
median 4Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
7
median 3Declared in manifest
Active users
27
median 2vs category median

Findings breakdown

Automated security signal · 21 distinct issues across 6 severities
21
distinct issues
detected

Permissions requested

5 risky permissions of 7 total
1 critical permission require attention
This extension requests 7 permissions in total. 5 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
Observe web requests

Can monitor all network requests made by the browser

High
Block and modify web requests

Can intercept, block, or modify any network request before it completes

High
View open tabs

Can see URLs and titles of all open tabs

High
Manage downloads

Can initiate downloads and access your download history

Medium
Store local data

Can save data locally in the browser for persistence

Medium
Write to clipboard

Can place content onto your clipboard

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Scan performed by extenshi.io · Aug 10, 2026
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