Firefox 3.5 includes the following new features:

* Firefox now available in more than 70 languages.
* Improved tools for controlling your private data, including a Private Browsing Mode.
* Better performance and stability with the new TraceMonkey JavaScript engine.
* The ability to provide Location Aware Browsing using web standards for geolocation.
* Support for native JSON, and web worker threads.
* Improvements to the Gecko layout engine, including speculative parsing for faster content rendering.
* Support for new web technologies such as: HTML5