SECURITY REPORT · EXTENSHI SCAN
Yubikey Companion
Firefox extension·by dyeray
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
Yubikey Companion's safety score vs every other extension we've scanned
Globally
30%of extensions carry more risk
Riskier ←→ Safer
Ranked against 415,874 extensions
In Privacy & Security
32%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 12,622 privacy & security extensions
Findings
8
median 10Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
4
median 4Declared in manifest
Active users
74
median 3vs category median
Findings breakdown
Automated security signal · 8 distinct issues across 6 severities
8
distinct issues
detected
detected
Critical113%
High113%
Needs Review00%
Medium563%
Low113%
Info00%
Permissions requested
1 risky permission of 4 total
1 critical permission require attention
This extension requests 4 permissions in total. 1 of them grant broad capabilities that are worth a careful look.
Critical
Communicate with desktop apps
Can exchange messages with applications installed on your computer
Medium
Custom menus
Can add custom items to the browser context menu
Medium
Access current tab
Can temporarily access the content of the active tab when you click the extension
Medium
Store local data
Can save data locally in the browser for persistence
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Scan performed by extenshi.io · Aug 25, 2026
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