Somehow I just went to move a tab from one window to another and it actually just copied it. I have no idea how that happened but its something i want to know. so i was googling it and found the following for something else ...
"Just use the Alt+D shortcut key to put the focus into the address bar, and then use Alt+Enter to open that URL in a new tab. The trick is that you don't have to move your thumb off the Alt key—just push down Alt, then hit D and Enter in quick succession to duplicate the current tab in a new tab."
why am I just learning this now. Its so simple