- 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 <video> and <audio> elements, downloadable fonts and other new CSS properties, JavaScript query selectors, HTML5 offline data storage for applications, and SVG transforms.
Firefox 3.5 RC3 รจ disponibile anche nella localizzazione italiana per S.O. Windows, Linux e Mac OS X: