Mozilla Firefox 9 beta 4 for Windows, Mac and Linux is now available for download and testing. What’s new in this beta?
Fixed several stability issues.
Added Type Inference, significantly improving JavaScript performance
Improved theme integration for Mac OS X Lion
Added two finger swipe navigation for Mac OS X Lion
Added support for querying Do Not Track status via JavaScript
Added support for font-stretch
Improved support for text-overflow
Improved standards support for HTML5, MathML, and CSS
Mozilla Firefox 9 beta 4 Release Notes
