Is This Chrome Extension Safe to Install? How to Check

Is this Chrome extension safe to install?

Short answer

There is no automated yes-or-no answer. Check who publishes it, whether the permissions match its features, which sites it can access, what the code references and how it updates. A clean static report reduces uncertainty but cannot guarantee that an extension is safe.

Drop an extension package hereor choose a file from your deviceChoose a fileSupported: CRX, XPI, ZIP, manifest.json. Maximum size: 25 MB.

Processed locallyCode is never executed

Your file stays in this browser. Parsing happens in a Web Worker; the extension code is read, never executed.

What the scan checks

Permissions, host access, content scripts, background scripts, CSP, externally_connectable, web-accessible resources, JavaScript patterns, referenced domains and risk categories.

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Static analysis shows references and patterns. It cannot prove that network activity happened or that an extension is malicious.

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See permission, domain and finding changes between two packages.

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A five-part safety checklist

Start with the publisher and listing. Look for a real website, a support channel and a privacy policy that names the data collected. Then inspect the package with a static analyzer.

Focus on host access, sensitive APIs, content scripts, remote code indicators and external domains. Finally, consider update behavior and whether you can live with the access after future changes.

1
Identify the publisher
Prefer recognizable developers with a documented support path.
2
Match permissions to features
Unused powerful permissions are a warning sign.
3
Review website access
Narrow hosts are safer than all_urls for a niche tool.
4
Read code findings
Check dynamic code, remote scripts, cookies and messaging.
5
Plan for updates
Re-check permissions after major versions and remove unused add-ons.

Signals that deserve extra caution

Be cautious when a simple utility requests all_urls, cookies, debugger, nativeMessaging or proxy access; when the privacy policy is missing or vague; when the update URL is not HTTPS; or when the package contains obfuscated code and remote script references.

These signals are not proof of malice. They are reasons to slow down, look for alternatives and ask the publisher questions.

What a static report cannot tell you

It cannot prove runtime behavior, account access or data transmission. It also cannot see code loaded after installation. If the stakes are high, use a separate browser profile and monitor requests with developer tools.

Frequently asked questions

Are Chrome Web Store extensions safe?

Store review reduces some risks but does not guarantee privacy or future safety. Extensions can update and request new permissions.

Can an extension steal my passwords?

A content script on a login page can read form fields it can access, and broad permissions increase reach. Whether it does so requires runtime analysis or a code audit.

Should I install an extension with a high risk score?

Only if you understand and accept the specific exposure. Consider narrower alternatives and limit the sites where the extension can run.

How do I check an extension before installing it?

Download the CRX or use a store URL in this analyzer. Review permissions, host access, code findings and domains before enabling it.

Last reviewed: October 31, 2026