Browser extensions are incredibly useful, but they can also be a major security risk. Malicious extensions can steal your passwords, track your browsing, inject ads, or even hijack your accounts. Here's how to check if a Chrome extension is safe before you install it.

1. Check the Permissions

Before installing any extension, review the permissions it requests. Be wary of extensions that ask for "Read and change all your data on all websites" — this gives the extension full access to everything you do in your browser. Legitimate extensions usually only need access to specific sites or limited browser features.

2. Look at the Developer

Check who published the extension. Established companies and well-known developers are generally safer. Look for a developer website, contact information, and a privacy policy. Be cautious of extensions from unknown developers with no online presence.

3. Read the Reviews

User reviews can reveal problems that aren't immediately obvious. Look for complaints about unexpected behavior, excessive ads, or performance issues. Be skeptical of extensions with only 5-star reviews — these could be fake.

4. Check the Source Code

For open-source extensions, you can review the code on GitHub or similar platforms. Look for suspicious patterns like obfuscated code, connections to unknown servers, or code that accesses your cookies and browsing history.

5. Use an Automated Scanner

Tools like ExtSafe can automatically analyze an extension's code, permissions, and behavior patterns to identify security risks. Simply paste the Chrome Web Store URL and get a detailed security report in seconds. ExtSafe checks for 82 permission risk profiles, 26+ suspicious code patterns, vulnerable libraries, and dangerous permission-code combinations.

6. Monitor Installed Extensions

Even safe extensions can become dangerous after an update. Regularly review your installed extensions, remove ones you no longer use, and re-scan them periodically. Extensions can be sold to new developers who may add malicious code.

Red Flags to Watch For

Requests for excessive permissions
Obfuscated or minified code with high entropy
Connections to unknown external domains
Access to cookies combined with network requests
Recently changed ownership
Missing or vague privacy policy

Staying safe online means being proactive about the extensions you install. Take a few minutes to verify each extension before adding it to your browser — your security is worth the effort.

How to Check if a Chrome Extension is Safe