Opera 12 had, which doesn't really exist anymore. It's Blink based now and I don't recall the feature being restored (yet). http://help.opera.com/Windows/12.10

Opera 12 had, which doesn't really exist anymore. It's Blink based now and I don't recall the feature being restored (yet). http://help.opera.com/Windows/12.10/en/unite.html http://help.opera.com/Windows/12.10/en/unite.html