[drusepth]

From the extension description:

>You may not realize it, but all of that color is designed to hijack your brain and keep you browsing.

>Grayscale the Web is a great solution to help with this. It removes all of the color, giving sites a plain, grayed out look. They will appear much more boring, and that's the whole point. You'll soon find that time wasting sites hold your attention less, and this will hopefully help you focus on whatever it is you really need to be doing.

[mettamage]

Ah, I skimmed the description too fast then. Thanks you.

The colors on HN keep my attention quite well!

[gowld]

That's the claim, but not an explanation. HN isn't multi-color.

[devastora]

You have a point. But even though HN doesn't have a ton of color, it still feels different on grayscale I think.

Most of the evidence is anecdotal, but it seems to work for a lot of people (myself included). I went into it more here - https://news.ycombinator.com/item?id=17133984