Checks all links on a page for any external links that do not have the attribute rel="nofollow" and highlights them in a red border.
The attribute rel="nofollow" provides a way for webmasters to tell search engines "Don't follow links on this page" or "Don't follow this specific link."
This tool will add a red border around any links that are leading away from the current website that do not have this attribute.
* Auto enable for all websites - highlight all external links on all webpages when you visit them.
* Select colour for link highlighter - change the colour of the border that highlights links.