Mozilla's getting close to unleashing a Release Candidate version of Firefox 4, but in the meantime, you can play around with the latest beta version, the browser maker announced in a blog post.
"The latest Firefox 4 Beta is available to test the cool features and improvements in the next version of Firefox," Mozilla said. "As we continue to refine features and performance in Firefox 4 Beta, this release includes faster start-up time, bookmarking, and makes complex animations smoother."
The beta also gives longtime Firefox users some time to get used to the new look, which now bears a strong resemblance to Google's Chrome browser. Underneath the hood, Firefox 4 boasts a boatload of changes and additions, including HTML5 support, multi-touch support, WebM and HD video, full hardware acceleration, and more.