I want to create an extension that adds content on third party sites. I will not show any advertising and I will not hide the site's content.
I'd like to add my related content to 5 or 6 third party websites, something like this http://i.imgur.com/jQx1r.jpg Obviuosly, only my users, if they have installed my browser extension, will see my contents on third party websites.
Are there legal policy problems about the developing of this extension or could i proceed without any problem?
Can the site owner ban my extension or sue me?