You wont notice any changes in the user interface or in fact any other visible changes. This new version also comes with lots of bug and stability fixes, and overall speed increase. If you are a Mac user, then Firefox 9 lets you use “two finger swipe navigation”. This new version comes with the following major changes:
- 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
- Fixed several stability issues
For more details about all the changes that comes with this new version, refer the full release notes.