You will see "+" and "-" buttons at the lower right corner of any pages you will open, after the installation is complete.
Mouseover, you can see the mood and interests of the current page.
You can like or dislike any internet pages, clicking on these buttons. The expansion will remember your choice and step-by-step adapt the next pages content. It will be filtered all you do not like and show more often what you're interested.
Moreover, you can see the mood and interests of any links.