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