Does your browser have this feature? Possibly invoked via Ctrl+D?

We have it - upvote a submission, and then it is available in the 'upvoted submissions' link in your profile.

I think we have favorites

I must be having problems with my vision today...! Now I see it! Thanks for flagging.

Note that "favorites" are public - I can view your favorited links and comments and you can view mine. (You like arthropod illustrations huh?) But your list of upvotes is private, so you can treat that like a private list of favorites.

more: https://github.com/minimaxir/hacker-news-undocumented

Haha! Got me there. Yes I did like those :) good to know the favorites are public!

Hmm. I don't see that on mine... Maybe only if you have certain karma?

yes we have em they are favorites.

at top of post youll see |hide|past|favorite|comments

click favorite and you mark the posting. you can view your favorite list in your profile.