I wrote a userscript that implements exactly that, but with the added benefit of storing every time you visited that page, so you can select between all your vi

I wrote a userscript that implements exactly that, but with the added benefit of storing every time you visited that page, so you can select between all your visits to that page and see which comments have been added after each visit. https://gist.github.com/justjanne/e61fcc9edb7d3dc60bc1a788d0329a0e https://gist.github.com/justjanne/e61fcc9edb7d3dc60bc1a788d0...