Firefox 3, the next generation web browser from Mozilla, has been released as a beta software officially in Mozilla's web site. The Firefox 3 beta includes approximately 900 new features which improves user experience, security, stability & performance.
The English version of the browser for Microsoft Windows can be downloaded from here. If you want to download for other operating systems and with regional language support, visit Mozilla's download centre.
Read the release notes to know more about the new features introduced in Firefox 3 beta.