We'll create fresh WordPress site with Show External Links installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Show External Links provides information on all external links on the site pages.
You can see the info window with the total number of links on the current page. Also, all links stand out and become visible.
If you do not see all the links on the page, check the source code. Perhaps, they are hidden.
The plugin works only for authorized users with administrative rights.
The plugin does not take into account the WordPress admin bar and the links specified in the skip-sites field.
Follow plugin development on Github.