This is done by getting the 500 newest and top stories and comparing them against your likes, building your own personalized homepage.
Also, when I find something I like, I usually want to explore similar stuff. So I created embeddings for 500k historical stories (all above 20 points) and added a 'similar' button that shows you the closest stories.
I thought of making this a web app, but I wanted something that integrated as seamlessly as possible with HN, so I decided on a browser extension.
I would love your feedback!