Huh? It's [0] a unified feature, for both iOS and OS X. See the "Content Blocking Safari Extensions" section, specifically the sub-section titled "OS X". [0]

Huh? It's [0] a unified feature, for both iOS and OS X. See the "Content Blocking Safari Extensions" section, specifically the sub-section titled "OS X". [0] https://developer.apple.com/library/prerelease/mac/releasenotes/General/WhatsNewInSafari/Articles/Safari_9.html https://developer.apple.com/library/prerelease/mac/releaseno...