SECURITY REPORT · EXTENSHI SCAN
Free Visio Viewer (Mac, Windows, Linux)
Firefox extension·by Lucidchart
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
- 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
Free Visio Viewer (Mac, Windows, Linux)'s safety score vs every other extension we've scanned
Globally
68%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Web Development
46%of web development extensions carry more risk
Riskier ←→ Safer
Ranked against 14,329 web development extensions
Findings
7
median 4Lower is safer
Critical findings
0
median 0Severity = Critical
Permissions
0
median 3Declared in manifest
Active users
1582
median 3vs category median
Findings breakdown
Automated security signal · 7 distinct issues across 6 severities
7
distinct issues
detected
detected
Scanners reported 14 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical00%
High00%
Needs Review00%
Medium457%
Low343%
Info00%
Permissions requested
0 permissions declared
No permissions requested
This extension doesn't request any browser permissions. That's unusually clean.
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Scan performed by extenshi.io · Aug 7, 2026
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