SECURITY REPORT · EXTENSHI SCAN
Nano Defender for Firefox
Firefox extension·by LiCybora
0
/ 100 SAFETY SCORE
DANGEROUS
Meaningful risk surface. Avoid on managed devices without review.
Likely abandonedsafety score reduced by 30 points
- No update in over 5 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
Nano Defender for Firefox's safety score vs every other extension we've scanned
Globally
12%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Privacy & Security
8%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 11,537 privacy & security extensions
Findings
29
median 5Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
6
median 4Declared in manifest
Active users
4377
median 3vs category median
Findings breakdown
Automated security signal · 29 distinct issues across 6 severities
29
distinct issues
detected
detected
Critical310%
High724%
Needs Review00%
Medium1345%
Low621%
Info00%
Permissions requested
5 risky permissions of 6 total
5 high-risk permissions require attention
This extension requests 6 permissions in total. 5 of them grant broad capabilities that are worth a careful look.
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
View open tabs
Can see URLs and titles of all open tabs
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
Monitor navigation
Can observe and track tab navigation events and URL changes
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Scan performed by extenshi.io · Aug 18, 2026
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