MetaHTTPMask Headers is a Firefox extension for viewing and searching HTTP response headers from any endpoint. It is intended for web developers and technical users debugging or inspecting web requests, and is available on Firefox for desktop and Android.
In the Browser DevTools & extensions space, MetaHTTPMask Headers takes a focused approach. It focuses on inspecting and searching HTTP response headers without leaving the browser. MetaHTTPMask Headers is a consumer product aimed at web developers and technical users. It is available for free. MetaHTTPMask Headers is available on the web, embeddable surfaces, and Android.
It is developed by Jenni, and it first shipped in 2026. Key capabilities include header viewing, header search, and endpoint inspection. The interface is available in 32 languages, including Czech, German, and Greek.
Summary written by a language model from the project’s public pages.
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