
New Tab Button 0.1.21 is now available for download. This version adds new tab icon to the header view (see the preview). You can open a message in a new tab by clicking it. If you don't need the button, open New Tab Button's option and uncheck the "Add button to header view" option. It also supports Thunderbird3.0.*. It means you can install it to forthcoming RCs and official release builds.