It may not have been clear from sillysaurus3's comment, but the "hckrnews" extension defines "new" differently. It keeps a database of the last time that you'v

It may not have been clear from sillysaurus3's comment, but the "hckrnews" extension defines "new" differently. It keeps a database of the last time that you've visited each page, and highlights all the comments that are new since your last visit. I use it as well, and it's great. When I access HN from a browser without it it feels practically unusable. My only issue with it is that I sometimes accidentally click on the "collapse thread" option. Ironically, considering the topic of this thread, I don't use or want that functionality, and would prefer an option to disable it. But highlighting the posts since the last visit is fabulous!