Mozilla Firefox, or simply Firefox, is a free and open-source[22] web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards.[23] In 2017, Firefox began incorporating new technology under the code name Quantum to promote parallelism and a more intuitive user interface.[24] Firefox is officially available for Windows 7 or newer, macOS, and Linux.