It also exists on Firefox https://addons.mozilla.org/fr/firefox/addon/hacker-news-mark-all-read/ https://addons.mozilla.org/fr/firefox/addon/hacker-news-mark...

It also exists on Firefox https://addons.mozilla.org/fr/firefox/addon/hacker-news-mark-all-read/ https://addons.mozilla.org/fr/firefox/addon/hacker-news-mark... Functionalities Mark news as read Hide news already read Mark comments of a new item as read Follow comments of a news item Displaying on the front page number of unread comments Hiding of already read comments Collapsing of long comment thread Showing of parent comment in long comment thread