The latest beta version of the Opera web browser has been released to Mac users. Opera 10.50 beta has been rebuilt using the Cocoa framework, allowing the software to include a unified toolbar, native buttons and scrollbars. The update also includes Growl notification support and new multi-touch gesture support. Other new features include private browsing, an improved JavaScript engine, new Opera Widgets, Mac OS X 10.4 support, and more. The beta release is available as a free download from Opera Softwares website.