Ask HN: Showing unread comments in Chrome

I've been using the "HN Unread Comments" plugin for years now but recently I've noticed it has stopped working on multiple machines. It's possible that it is operator error but I'm assuming it just doesn't work anymore.

Does anyone have suggestions for a plugin which will make it clear which comments I have/haven't read? I've seen a few but they all include a lot of other changes, I'd love something which only highlighted unread comments.

I'm curious what's out there and what other folks are using.