On Friday, Mozilla released Firefox 3 Release Candidate 1, which means exactly as the tag says: unless any major bugs are reported, Firefox 3 RC1 is going to be the final version of Firefox 3, which is planned for June.
Windows Vista users will notice a slight visual refresh. The Bookmark Organizer or "Library" now has a black glossy interface, which resemble with Vista’s looks and feel. The line which separates toolbars from the address bar has now been removed. "Clear" button has been put back into Firefox 3′s download manager.
Help documentation has been removed from the installation, instead, it will now be available online. That way, it will be easier for them to change their documentation without actually releasing a new version of Firefox.
Performance wise, Firefox 3 RC1 is faster and better than previous builds. This is not the final release, so bugs can still exist within the next generation browser. Firefox 3 RC1 is available in 45 different languages for Windows, Linux and Mac. As usual, it won’t work on any operating system prior to Windows 2000.