Opera has released its latest beta web browser Opera 11, with Tab Stacking (grouping) option for Windows, Mac, Linux and UNIX platform users. Featuring the Presto 2.7 JavaScript engine, the Opera 11 Beta will let you add extensions, better mouse gestures and a slew of other improvements. If you have more than one webpage open of a site or something you're researching on, you can stack/group those tabs together to make room for more tabs.


Opera has always been obsessed with the Tabs and we've already seen Tabbed browsing, Tab thumbnails and Visual Tabs. The visual aspect of Opera as a browser constant kept changing and now we have the Tab Stacking feature. Apart from that, Opera 11 Beta also brings browser extensions and add-ons to make your browsing more productive and efficient. Access the extensions and add-ons catalog at http://addons.labs.opera.com.


In case you've forgotten about Mouse Gestures, the new Opera 11 Beta brings new visual interface for discovering mouse gestures that can be used as time saving shortcuts. Check the full list of Mouse Gestures here.


Here are the other additions made in the Opera 11 browser:


Address field now hides unnecessary information and puts the security status of each page front and center. Now, badges explain the security state of the site, giving consumers clear information about the sites they visit.
Plug-ins can be set to load on-demand. This can give as much as 30 percent performance improvement.
Extensions and Opera Unite applications are updated automatically through Opera's update mechanism.
Even more work has been done to boost browsing speed, particularly for Linux. Opera 11 for Linux is 15 to 20 percent faster on common benchmarks than Opera 10.63.
Bookmarks are just a click away, thanks to a new bookmarks bar that replaces Opera s personal bar.
Opera 11 is 30 percent smaller than Opera 10.63, despite including new features.

Final builds of Mozilla Firefox 4, Google Chrome 9 and Microsoft Internet Explorer 9 web browsers are scheduled for release in early 2011. But that's couple of months away. Download the new Opera 11 Beta from : http://www.opera.com/browser/next/.