K-Meleon is a free and open-source, lightweight web browser for Microsoft Windows. Unlike cross-platform browsers, it uses the native Windows API to create its user interface. Early versions of K-Meleon render web pages with Gecko, Mozilla's browser layout engine. The Firefox web browser and the Mozilla Thunderbird email client also use Gecko. K-Meleon became a popular browser for Windows and was available as an optional default browser in Europe via BrowserChoice.eu. After Mozilla deprecated embedding Gecko, K-Meleon continued to use it for several years. Current versions of K-Meleon use the Goanna layout engine. Goanna is a fork of Gecko created for the Pale Moon browser.
K-Meleon began with the goal of being faster and lighter than Mozilla's original internet suite. Until 2011, K-Meleon embedded Gecko in a stripped-down interface. Throughout its lifespan, K-Meleon has required small amounts of memory. K-Meleon 76 supports platforms no longer supported by Mozilla after the Firefox Q