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SECURITY REPORT · EXTENSHI SCAN

Castorus

Firefox extension·by Castorus
68
/ 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

Castorus's safety score vs every other extension we've scanned
Globally
11%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 415,560 extensions
In Shopping
8%of shopping extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 4,517 shopping extensions
Findings
77
median 9Lower is safer
Critical findings
2
median 0Severity = Critical
Permissions
7
median 4Declared in manifest
Active users
4935
median 3vs category median

Findings breakdown

Automated security signal · 77 distinct issues across 6 severities
77
distinct issues
detected

Permissions requested

5 risky permissions of 7 total
2 critical permissions require attention
This extension requests 7 permissions in total. 5 of them grant broad capabilities that are worth a careful look.
Critical
Manage other extensions

Can enable, disable, or uninstall other browser extensions

Critical
Access to all websites

Can read and modify content on every website you visit

High
View open tabs

Can see URLs and titles of all open tabs

High
Observe web requests

Can monitor all network requests made by the browser

High
Execute scripts in pages

Can inject and execute JavaScript code in web pages

Medium
Store local data

Can save data locally in the browser for persistence

Low
Schedule tasks

Can schedule periodic background tasks

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Scan performed by extenshi.io · Oct 19, 2026
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