HTTP Header Spy

HTTP Header Spy

HTTP Header Spy enables you to inspect request- response headers and cookies right after page load with no extra clicks.

HTTP Header Spy promo image
What is HTTP Header Spy?

HTTP Header Spy is a Firefox add-on that enables you to inspect request-response headers and cookies right after page load. It provides features such as response times, server IP, XHR and sub-frame requests, and more. With HTTP Header Spy, you can view headers directly in the page without the need for extra clicks or opening the page inspector tool.

Users: 356 ▲ 10
Rating: 4.75 (4)
Version: 2.0.49 (Last updated: 2020-01-09)
Creation date: 2020-01-09
Weekly download count: 17
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • http://*/*
  • https://*/*
  • tabs
  • activeTab
  • storage
  • webRequest
Size: 608.70K
URLs: Website
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
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HTTP Header Spy enables you to inspect request- response headers and cookies right after page load with no extra clicks.

Inspect HTTP headers and response times without opening the page inspector tool. View headers right in the page you are looking at.

★ Auto-hide information panels after specified time ★ Response times ★ Server IP ★ XHR and sub-frame requests ★ Headers also available in the browser action popup ★ Follow the full redirect path ★ Show HSTS requests ★ Colorful status indication icons ★ Inspect Form Data, Get parameters and Cookies ★ Micro mode shows just the chosen response headers ★ Position in one of the four corners of the window

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User reviews
It's a good add-on, but it needs to be updated because it keeps not working on the latest Firefox, and forces me to uninstall/reinstall it constantly for the functionality to work.
by pnhan, 2023-06-18
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Risk impact

HTTP Header Spy is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install HTTP Header Spy if you trust the publisher.

Risk likelihood

HTTP Header Spy has earned a fairly good reputation and likely can be trusted.

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