duplicate-tab
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Press Alt+Shift+D to duplicate the current tab (Option+Shift+D on Mac).
Chrome Web Store: https://chrome.google.com/webstore/detail/duplicate-tab-shortcut/klehggjefofgiajjfpoebdidnpjmljhb
Firefox Addons: https://addons.mozilla.org/addon/duplicate-tab-shortcut/
Icon: http://findicons.com/icon/208731/copy