Here is a nifty little keyboard shortcut to duplicate a tab when using Google’s Chrome browser.
Assuming that you are currently in the tab which you wish to clone, first press Alt+D to highlight the address bar, and the Alt+Enter to duplicate the tab.
What’s particularly nice is of course the fact you can chain these together by simply holding down the Alt key and then pressing the D key followed by the Enter key.
Useful if you don’t feel like going to the effort of moving your mouse cursor over a tab and selecting the ‘Duplicate’ option from the context menu that pops if should you right-click.