SECURITY REPORT · EXTENSHI SCAN
Substack Notification Filter
Firefox extension·by Mythraps
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
Substack Notification Filter's safety score vs every other extension we've scanned
Globally
79.13%of extensions carry more risk
Riskier ←→ Safer
Ranked across every extension we scan
In its category
69.13%of its category extensions carry more risk
Riskier ←→ Safer
Ranked within its category
Findings
2
median 38Lower is safer
Risky permissions
0
median 1Critical + high perms
Total permissions
4
median 4All declared perms
Critical findings
1
median 2Severity = Critical
Findings breakdown
Automated security signal · 2 findings across 5 severities
2
findings
detected
detected
Critical150%
High00%
Medium150%
Low00%
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
https://substack.com/*
No additional information available.
Info
https://*.substack.com/*
No additional information available.
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Scan performed by extenshi.io · Jun 25, 2026· partial run (some scanners failed)
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