SECURITY REPORT · EXTENSHI SCAN
Mailcatcher Viewer
Firefox extension·by Sika
0
/ 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
Mailcatcher Viewer's safety score vs every other extension we've scanned
Globally
24%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Web Development
13%of web development extensions carry more risk
Riskier ←→ Safer
Ranked against 14,329 web development extensions
Findings
17
median 4Lower is safer
Critical findings
2
median 0Severity = Critical
Permissions
4
median 3Declared in manifest
Active users
1
median 3vs category median
Findings breakdown
Automated security signal · 17 distinct issues across 6 severities
17
distinct issues
detected
detected
Critical212%
High00%
Needs Review00%
Medium1376%
Low212%
Info00%
Permissions requested
4 permissions declared
No risky permissions
4 permissions requested — none are flagged as risky.
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Access current tab
Can temporarily access the content of the active tab when you click the extension
Info
http://*/
No additional information available.
Info
https://*/
No additional information available.
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Scan performed by extenshi.io · Aug 17, 2026
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