SECURITY REPORT · EXTENSHI SCAN
KeyCat opensource password manager
Firefox extension·by Key.cat
0
/ 100 SAFETY SCORE
CRITICAL
Severe indicators. Treat as unsafe until the developer addresses these findings.
Likely abandonedsafety score reduced by 30 points
- No update in over 6 years
Why this matters
An unmaintained extension keeps whatever flaws it shipped with, and a listing with users but no owner is an attractive target to buy and repurpose.
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
KeyCat opensource password manager's safety score vs every other extension we've scanned
Globally
2%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Privacy & Security
1%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 11,537 privacy & security extensions
Findings
117
median 5Lower is safer
Critical findings
2
median 0Severity = Critical
Permissions
9
median 4Declared in manifest
Active users
1
median 3vs category median
Findings breakdown
Automated security signal · 117 distinct issues across 6 severities
117
distinct issues
detected
detected
Scanners reported 185 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical22%
High3126%
Needs Review00%
Medium5950%
Low2017%
Info54%
Permissions requested
5 risky permissions of 9 total
5 high-risk permissions require attention
This extension requests 9 permissions in total. 5 of them grant broad capabilities that are worth a careful look.
High
View open tabs
Can see URLs and titles of all open tabs
High
Access all HTTP sites
Can read and modify content on all non-encrypted websites
High
Access all HTTPS sites
Can read and modify content on all encrypted websites
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
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Write to clipboard
Can place content onto your clipboard
Low
Detect idle state
Can detect when your machine is idle, active, or locked
Info
file:///*
No additional information available.
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Scan performed by extenshi.io · Aug 14, 2026
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