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SECURITY REPORT · EXTENSHI SCAN

Calendar Extension for Google Calendar™

Firefox extension·by Sergey
75
/ 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

Calendar Extension for Google Calendar™'s safety score vs every other extension we've scanned
Globally
24%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 403,022 extensions
In Other
7%of other extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 28,734 other extensions
Findings
126
median 3Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
4
median 3Declared in manifest
Active users
17
median 2vs category median

Findings breakdown

Automated security signal · 126 distinct issues across 6 severities
126
distinct issues
detected

Permissions requested

4 permissions declared
No risky permissions
4 permissions requested — none are flagged as risky.
Medium
Access user identity

Can get OAuth2 tokens and access your Google account identity

Medium
Store local data

Can save data locally in the browser for persistence

Medium
Show notifications

Can display desktop notifications outside the browser

Low
Schedule tasks

Can schedule periodic background tasks

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Scan performed by extenshi.io · Sep 6, 2026
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