You don't 'see' the problems unless you know what to look for. One sign is that the spinner in the top left corner doesn't end. Check the console for errors too.

The primary issue is that the DOM parsing fails due to changes in the HTML structure and the extension throws NPE's.

Oh! Yes, then I do see this. Thank you for the pointer to the PR and the explanation.

I've been collecting thoughts on the next generation extension to make for HN. Hopefully when I have a bit more time (in the middle of a giant home remodel), I'll find some time to implement it. One core thought that I really enjoy about this extension is that it doesn't really change the UI/UX at all, it just refines it. I think that is important.