Microsoft has released an IE11 developer preview for Windows 7 with improved developer tools that enable quick inspection, editing, and visualization of content as well as performance analysis and emulation of multiple devices. Firefox OS is an open source mobile operating system built on web technologies that allows apps to be created with HTML5, JavaScript and other open standards. Tridiv is a web-based editor for creating 3D shapes in CSS while TypeWonder lets users preview different web fonts on live sites. The next version of Android is called KitKat, continuing Google's tradition of using treat names but being the first specific brand name used.