Mozilla’s work on the next version of Firefox reached the beta stage, as the organization released
Firefox 3.1 beta 1.
The new version is based on the Gecko 1.9.1 rendering engine, which has been under development for six months. Improvements in the latest release include 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; and improved control over the Smart Location Bar using special characters to restrict your search.
The latest beta can be downloaded from the Mozilla Web site.