> What would it break that isn't user-hostile? The Facebook "Like" button for starters. Is that user-hostile? Is that important? It's in the eye of the beho

> What would it break that isn't user-hostile? The Facebook "Like" button for starters. Is that user-hostile? Is that important? It's in the eye of the beholder, but if Firefox "doesn't work" for a large tranche of non-technical users, that's a big problem. It's also not clear how much it would achieve. It's not that difficult to turn a 3rd party cookie into a 1st party one.