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Browser Extension Headers Check - Online Detect Injected Scripts

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Browser Extension Headers Check

Instantly analyze HTTP response headers of any URL to detect potential browser extension injected scripts or suspicious modifications.

Uses a public CORS proxy to fetch real-time headers. No data is stored.
Response Headers
Header NameValue
headers received
Extension Injection Analysis
Look for uncommon headers added by browser extensions during script injection or request modification.
Recent Checks

Frequently Asked Questions

Some browser extensions modify web pages by injecting JavaScript code or altering HTTP headers. This tool helps detect signs of such injections by examining the response headers of a URL.

Headers like X-Chrome-Extension, X-Firefox-Extension, or custom X-* headers added by privacy tools, ad blockers, or shopping assistants may indicate extension activity. We also flag unusual CSP directives that allow extension resources.

We use a third‑party CORS proxy to fetch headers. Your URL is sent to that proxy. We do not store or log any requests on our servers.

No, the proxy can only reach publicly accessible URLs. Local addresses (localhost, 127.0.0.1) are not supported.

That means none of the known extension‑related patterns were found. However, some extensions inject scripts without leaving header traces. Use additional browser developer tools to inspect network requests.
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