One of the very few security inspired restrictions I can wholeheartedly agree with. I don't want random websites be able to read my localhost. I hope it gets accepted and implemented sooner than later.

OTOH it would be cool if random websites were able to open up and use ports on my computer's network, or even on my LAN, when granted permission of course. Browser-based file- and media sharing between my devices, or games if multi-person.