Nunus

On the nytimes.com front page, this Nunus browser extension (Chrome and Firefox) grays out article titles you've already seen.
Also, autoplay is (optionally) removed from videos.
Option-downArrow jumps to the next unseen title.
If the same title appears again later on the page, the later occurrences are immediately grayed out.
'Already seen' means at least 20 pixels of the title were on the screen for 3 seconds in a previous session.
Typical Use Case:
You get up in the morning and read the NYTimes. Then, later in the afternoon or evening, you take a look at it again. Most of the stories are the same, but in fact they have added quite a few new titles about events from the day.
With Nunus, all of the article titles that you have already seen are grayed out. And you can type the option-DownArrow key to jump to the next unseen title.
Also great for the weekend, when *lots* of their articles are recycled from earlier in the week, or even weeks before.