SECURITY REPORT · EXTENSHI SCAN
Instant Ad-Close
Firefox extension·by Francesco De Stefano
0
/ 100 SAFETY SCORE
RISKY
Several elevated signals. Read the findings before sharing this with your team.
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
Instant Ad-Close's safety score vs every other extension we've scanned
Globally
25%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Privacy & Security
19%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 11,537 privacy & security extensions
Findings
18
median 5Lower is safer
Critical findings
4
median 0Severity = Critical
Permissions
10
median 4Declared in manifest
Active users
3
median 3vs category median
Findings breakdown
Automated security signal · 18 distinct issues across 6 severities
18
distinct issues
detected
detected
Critical422%
High528%
Needs Review00%
Medium633%
Low317%
Info00%
Permissions requested
5 risky permissions of 10 total
5 high-risk permissions require attention
This extension requests 10 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
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
High
Control privacy settings
Can modify browser privacy settings like Do Not Track and safe browsing
Medium
Unlimited local storage
Can store large amounts of data locally without size limits
Medium
Store local data
Can save data locally in the browser for persistence
Info
*://*/*
No additional information available.
Info
ws://*/*
No additional information available.
Info
wss://*/*
No additional information available.
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Scan performed by extenshi.io · Aug 12, 2026
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