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.
Improved theme integration for Mac OS X Lion
Added two finger swipe navigation for Mac OS X Lion
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