The latest Firefox 4 Beta is available to test the new features and improvements in the next version of Firefox.

This release includes faster start-up time, bookmarking and makes complex animations smoother, according to Mozilla.

Firefox 4 Beta is offering more control over the browsing experience. It introduces a fresh new look and features like App Tabs and Panorama to make it easier to navigate the Web. Firefox 4 Beta also includes performance enhancements to make everything faster from start-up time to page-load speed and the performance of Web applications and games. Firefox Sync is integrated into the browser with Firefox 4 Beta, giving users access to their Awesome Bar history, bookmarks, open tabs and passwords across computers and smartphones.

Firefox 4 Beta also enables developers to create fun Web apps and websites. With full support for HTML5 features in Firefox 4 Beta, developers can create new ways for people to enjoy the Web. This includes WebM and HD video, 3D graphic rendering with WebGL, hardware acceleration and the Mozilla Audio API to help create visual experiences for sound. Mozilla's director of Product Platform Management Chris Blizzard. has a full overview of all developer tools in Firefox 4 Beta.

Download Firefox 4 Beta here.