If you are reading a web page about “blue widgets” on a website bluewidgets.com and would like to discover other other web pages that are around the same topic, Google Similar Pages is for you.
The add-on, officially mainted by Google, allows you to quickly preview and explore other pages that are similar to the one you are browsing. It may suggest pages from the same domain or from other domains.
Internally, when you click the Similar Pages button in the Chrome toolbar, the browser will send a search query to Google to see if there are any similar pages for the page you are viewing. It uses the default country domain of Google for page suggestions though you can change it to use the main google.com engine.
This extension works best on homepages or the main page of most websites.