SECURITY REPORT · EXTENSHI SCAN
Historical Events Calendar
Firefox extension·by Margo
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
Historical Events Calendar's safety score vs every other extension we've scanned
Globally
81.63%of extensions carry more risk
Riskier ←→ Safer
Ranked across every extension we scan
In its category
71.63%of its category extensions carry more risk
Riskier ←→ Safer
Ranked within its category
Findings
1
median 38Lower is safer
Risky permissions
0
median 1Critical + high perms
Total permissions
1
median 4All declared perms
Critical findings
1
median 2Severity = Critical
Findings breakdown
Automated security signal · 1 finding across 5 severities
1
findings
detected
detected
Critical1100%
High00%
Medium00%
Low00%
Info00%
Permissions requested
1 permission declared
No risky permissions
1 permission requested — none are flagged as risky.
Medium
Store local data
Can save data locally in the browser for persistence
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Scan performed by extenshi.io · Jun 25, 2026· partial run (some scanners failed)
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