It is common for internal links to be opened in the same window and external links in a new window. This module will automatically take care of this if you make links in the CKEditor. The check mark to automatically detect a link must of course be turned on. You do not need to check anything for this module yourself. She does not work retroactively. The old nodes must be saved again.
The code target = "_ blank" is automatically added to external links.
It works ... Google opens in a new tab.