Mozilla will release the Firefox 3.5 on Tuesday, June 30,2009. It features a faster rendering engine, stability enhancements and a new JavaScript engine that boosts the performance of most web-based applications. Firefox 3.5 will also include support for the most widely-used elements of HTML 5, the set of next-generation web standards that allows for offline data access, enhanced web graphics and multimedia playback without plug-ins.

Source: Web Monkey