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You could always use https://github.com/openstyles/stylus to customize HN looks like

Oh wow, this is fantastic, thanks! I wonder if I can run it on FF mobile to make the site more friendly.

EDIT: I can, awesome. If anyone has a good theme to suggest, that would be fantastic.

So nothing that couldn't be solved by a better mobile friendly web site?

Which app are you using? There are quite a few on the Apple store.