Thumbnails Next to Google's Results for Similar Pages

If you click the small arrow next to the URL of a search result in the desktop Google interface, you'll usually see 2 menu items: "cached" and "similar". The second option lets you find related pages and it's rarely used.

It looks like Google now shows thumbnails next to the search results if the query includes the related: operator. Here's an example for [related:https://avocado.io avocado], a query automatically triggered by the "similar" link.

Update: Same thing for the link: operator.

{ Thanks, Nick. }