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Is Tampermonkey Legacy safe?

This security report analyses whether Tampermonkey Legacy is safe to install on your browser. We check Tampermonkey Legacy for malicious behaviour, data exfiltration, suspicious permissions, and known vulnerabilities so you can decide if Tampermonkey Legacy is safe for your personal or enterprise fleet.

Medium risk

Legitimate userscript manager with extensive permissions. PostMessage handlers lack origin validation which could allow malicious sites to inject content into pages.

v5.1.1Chrome Web Store
45Risk

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Updated 10 April 2026lcmhijbkigalmkeommnijlpobloojgfn

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