SECURITY REPORT · EXTENSHI SCAN
JWT Debugger
Firefox extension·by JWT.io
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 6 years
- Bundles libraries with known vulnerabilities and no fix in sight
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
JWT Debugger's safety score vs every other extension we've scanned
Globally
5%of extensions carry more risk
Riskier ←→ Safer
Ranked against 368,615 extensions
In Other
2%of other extensions carry more risk
Riskier ←→ Safer
Ranked against 26,652 other extensions
Findings
42
median 3Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
7
median 3Declared in manifest
Active users
915
median 2vs category median
Findings breakdown
Automated security signal · 42 distinct issues across 6 severities
42
distinct issues
detected
detected
Scanners reported 57 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical12%
High512%
Needs Review00%
Medium3174%
Low512%
Info00%
Permissions requested
2 risky permissions of 7 total
1 critical permission require attention
This extension requests 7 permissions in total. 2 of them grant broad capabilities that are worth a careful look.
Critical
Access to all websites
Can read and modify content on every website you visit
High
Access browser cookies
Can read and modify cookies, potentially accessing login sessions
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
Medium
Read clipboard
Can read text and data currently on your clipboard
Medium
Write to clipboard
Can place content onto your clipboard
Info
https://jwt.io/*
No additional information available.
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Scan performed by extenshi.io · Aug 14, 2026
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