Yea the tool will check which website you’re on and show posts about the site, and anyone can post new posts or reply to post. 

 It's amazing and something I always wanted. Let me ask you: The highlights made in https://highlighter.com/ will appear as comments in your extension? 

 Other question: How the comments I do with your extension will appear in clients like Primal, Nostter...? 

 Yup. New post show up in other clients too. When people in other clients reply, show on website too.