Heat Index is a Firefox browser extension that estimates apparent temperature using temperature and relative humidity. It is intended for Firefox users who need a quick heat-stress or weather calculation while browsing.
In the Browser DevTools & extensions space, Heat Index takes a focused approach. It focuses on estimating heat index from temperature and relative humidity without manual calculations. It is built as a consumer product for firefox users monitoring heat and weather conditions. Heat Index is free to use. Heat Index is available on the web and embeddable surfaces.
Behind Heat Index is Robert F. Thomas, and it first shipped in 2026. Among its 5 catalogued features are heat index estimation, temperature input, and humidity input. 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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