IIRC, no, it wasn't per-site, but disallowing third-party cookies overall was a setting in 3.x. The more relevant aspect, I think, is that there's an essential

IIRC, no, it wasn't per-site, but disallowing third-party cookies overall was a setting in 3.x. The more relevant aspect, I think, is that there's an essential/non-essential distinction in the law, which differs from 1st-party/3rd-party.