- Web standards improvements in the Gecko layout engine
- Added support for CSS 2.1 and CSS 3 properties
- A new tab-switching shortcut that shows previews of the tab you're switching to
- Improved control over the Smart Location Bar using specialcharacters to restrict your search
- Support for new web technologies such as the
It's expected that in the final version of Firefox 3.1, the offline application will be fully supported as they have completed the HTML5 Offline specification. Let's hope the Google Gears are doing their job too to make sure it will works with Firefox 3.1 in the future.