I use the leechblock plugin and have it redirect any site like twitter/reddit/hn to my todo list instead. I also have it setup so I can only view hackernews on Fridays so I'm not constantly loading it.

I also subscribe to https://hackernewsletter.com/ which is a list of all the interesting articles from hacker news from that week. (it comes out on Friday, thus I unblock on the site on my computer on Fridays)