Following the launch of Firefox 3.0.10, Mozilla also unveiled a new beta version of Firefox 3.5. People interested in testing the new beta browser can download it over here.
Improved tools for controlling your private data, including a Private Browsing Mode.
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.