SECURITY REPORT · EXTENSHI SCAN
No-Cache No-Store for Selected Hosts
Firefox extension·by jscher2000
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
No-Cache No-Store for Selected Hosts's safety score vs every other extension we've scanned
Globally
10%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Web Development
5%of web development extensions carry more risk
Riskier ←→ Safer
Ranked against 14,329 web development extensions
Findings
17
median 4Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
6
median 3Declared in manifest
Active users
68
median 3vs category median
Findings breakdown
Automated security signal · 17 distinct issues across 6 severities
17
distinct issues
detected
detected
Critical16%
High212%
Needs Review00%
Medium1271%
Low212%
Info00%
Permissions requested
3 risky permissions of 6 total
1 critical permission require attention
This extension requests 6 permissions in total. 3 of them grant broad capabilities that are worth a careful look.
Critical
Access to all websites(optional)
Can read and modify content on every website you visit
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
Access current tab
Can temporarily access the content of the active tab when you click the extension
Medium
Store local data
Can save data locally in the browser for persistence
Info
*://www.jeffersonscher.com/*
No additional information available.
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Scan performed by extenshi.io · Aug 20, 2026
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