[anotheryou]

For HN I prefer this one: https://github.com/andreicristianpetcu/HNMarkAllRead/release...

(chrome one is in the store)

It marks comments or posts as "read" (or "seen") for a whole page and than hides them. And you can tell it not to hide posts where you "subscribed" to the comments.

I can never go back, so tired of skimming over the same top posts all day again and again.

I think it also does tree comments.