WebGL is enabled on all platforms that have a capable graphics card with updated drivers.Direct2D Hardware Acceleration is now on by default for Windows 7 users.Certain graphics rendering operations are now hardware-accelerated using Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7, and OpenGL on Mac OS (OpenGL on Linux will be supported in the future).Firefox Sync is included by default, allowing you to securely synchronize between multiple computers and mobile devices.
Please read below for more detailed information about what's new in this version of the release, as well as the known issues. This release features JavaScript execution speeds up to six times faster than the previous version, new capabilities for Web Developers and Add-on Developers such as hardware accelerated graphics and HTML5 technologies, and a completely revised user interface. Firefox 4 is based on the Gecko 2.0 Web platform.
