this is extremely useful and it is one more reason why I really miss Chrome (and Firefox) on both tablets and smartphone. I read HN mostly on these devices where HN UX is really poor, this is one of those features I would love.

Another one is having bigger upvotes buttons and easier clickable links. Too often I have a hard time to click on the microscopic comments link, other times I open the wrong news or upvote the wrong one.