Firefox 3.1 Beta 3 is based on the Gecko 1.9.1 rendering platform, which has been under development for the past 9 months. Firefox 3.1 is an incremental release on the previous version with significant changes to improve web compatibility, performance, and ease of use:
- This beta is now available in 64 languages - get your local version.
- Improved the new Private Browsing Mode.
- Improvements to web worker thread support.
- New native JSON support.
- Improvements to the Gecko layout engine, including speculative parsing for faster content rendering.
You can download the Beta here