New Page Link plugin converts all your external or internal links in the body to always open in a new tab. Also you can add rel="nofollow" to selective links by typing their class names on options page. Class name will always end with a semicolon ';' more you can see yourself from the options page.
Stop any fake data sending visitors away - By default, Open WordPress Comment Links in New Tab/Window (add target=”_blank”) tab or window with: New Tab Redirect Plus.