The existing Netscape rendering engine, originally written for Netscape Navigator 1.0 and upgraded through the years, was slow, did not comply well with W3C standards, had limited support for dynamic HTML and lacked features such as incremental reflow (when the layout engine rearranges elements on the screen as new data is downloaded and added to the page). History ĭevelopment of the layout engine now known as Gecko began at Netscape in 1997, following the company's purchase of DigitalStyle. Mozilla officially supports its use on Android, Linux, macOS, and Windows.

It is free and open-source software subject to the terms of the Mozilla Public License version 2. Gecko is written in C++ and JavaScript, and, since 2016, additionally in Rust.

Gecko offers a rich programming API that makes it suitable for a wide variety of roles in Internet-enabled applications, such as web browsers, content presentation, and client/server. Gecko is designed to support open Internet standards, and is used by different applications to display web pages and, in some cases, an application's user interface itself (by rendering XUL). It is used in the Firefox browser, the Thunderbird email client, and many other projects. Gecko is a browser engine developed by Mozilla.

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