SECURITY REPORT · EXTENSHI SCAN

MJsonViewer

Firefox extension·by D0n9X1n
22
/ 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

MJsonViewer's safety score vs every other extension we've scanned
Globally
2%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 415,874 extensions
In Appearance
1%of appearance extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 19,041 appearance extensions
Findings
54
median 5Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
7
median 2Declared in manifest
Active users
119
median 3vs category median

Findings breakdown

Automated security signal · 54 distinct issues across 6 severities
54
distinct issues
detected

Permissions requested

4 risky permissions of 7 total
1 critical permission require attention
This extension requests 7 permissions in total. 4 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
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
Store local data

Can save data locally in the browser for persistence

Medium
Add context menu items

Can add custom items to the right-click context menu

Medium
Write to clipboard

Can place content onto your clipboard

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Scan performed by extenshi.io · Aug 18, 2026
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