According to the source[1] it looks like a chrome plugin that enables inline-commenting "web2.0" style here on Hackernews Screenshot from source: https://raw.g

According to the source[1] it looks like a chrome plugin that enables inline-commenting "web2.0" style here on Hackernews Screenshot from source: https://raw.github.com/Gwendall/ypander/master/screenshot.png https://raw.github.com/Gwendall/ypander/master/screenshot.pn... [1] https://github.com/Gwendall/ypander https://github.com/Gwendall/ypander