Download Firefox 3.1 Beta 3 New

Firefox 3.1 Beta 3 is the fifth development milestone and third beta release of Firefox 3.1, the next version of the Firefox web browser. While this release is considered to be stable, it is intended for developers and members of our testing community to use for early evaluation and feedback. Users of the latest released version of Firefox should not expect all of their add-ons to work properly with this beta.


What’s New in Firefox 3.1 Beta 3

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.
* Improved performance and stability with the new TraceMonkey JavaScript engine.
* New native JSON support.
* Improvements to the Gecko layout engine, including speculative parsing for faster content rendering.
* Support for new web technologies such as the