Firefox 3 Beta 1 sports usability enhancements that make it a big step forward over previous versions. It's proven stable enough to use as a production browser -- on some machines. On other machines, it's a pig.
3 is out in beta and better than ever, with usability enhancements that make the browser simpler and easier to work with. The new version of Firefox
fixes 300 memory leaks, and is based on the Gecko 1.8 Web rendering engine, designed to enhance performance and stability.