Mozilla Firefox (or simply Firefox) is a free and open-source web browser developed by Mozilla Foundation and its subsidiary, Mozilla Corporation. Firefox is available for Windows, macOS and Linux operating systems. Its sibling, Firefox for Android, is available for Android. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards. An additional version, Firefox for iOS, was released in late 2015; however, because of artificial restrictions imposed by Apple Inc., it is forced to use the platform-bundled WebKit layout engine. Firefox was created in 2002 under the codename "Phoenix" by the Mozilla community members who desired a standalone browser, rather than the Mozilla Application Suite bundle. During its beta phase, Firefox proved to be popular with its testers and was praised for its speed, security, and add-ons compared to Microsoft's then-dominant Internet Explorer 6. Firefox was released in November 2004, and challenged Internet Explorer's dominance with 60 million downloads within nine months. Firefox is the spiritual successor of Netscape Navigator, as the Mozilla community was created by Netscape in 1998 before their acquisition by AOL. Firefox usage grew to a peak of 32% at the end of 2009, temporarily making version 3.5 the world's most popular browser. Usage then declined in competition with Google Chrome. Asof September 2017, Firefox has between 5.96% and 13.6% of worldwide usage as a "desktop" browser, making it the second most popular web browser. Firefox is still the most popular desktop browser in Cuba (even most popular overall at 67.37%) and Eritrea with 82.6% and 87.17% of the market share, respectively. It is also the most popular desktop browser in many other African as well as Oceanic countries. According to Mozilla, as of December 2014 there were half a billion Firefox users around the world.