We’re very excited to announce the official release of Firefox 3.5! You can download Firefox 3.5 at firefox.com and enjoy the new features and faster performance. If you’re using the latest version of Firefox 3.0, you can get Firefox 3.5 by clicking on the Help menu and then selecting Check for Updates.
Mike Beltzner, Director of Firefox has a comprehensive post here. The post includes a list of some of the coolest Firefox 3.5 features, excerpted below.
Firefox 3.5 is available in more than 70 languages – get your local version.
We have included tools for controlling your private data, including a Private Browsing Mode, and the ability to go back in time and Clear Recent History.
Firefox 3.5 has support for the HTML5
The browser features faster performance on complex websites thanks to the new TraceMonkey JavaScript engine.
This release includes improvements to the Gecko layout engine, including speculative parsing for faster content rendering.
Firefox 3.5 supports new web technologies such as: downloadable fonts, CSS media queries, new transformations and properties, JavaScript query selectors, HTML5 local storage and offline application storage,