appleinsider.com · Saved

Inside App Extensions: WebKit Content Blockers extend user privacy in iOS 9, OS X Safari 9

appleinsider.com/articles/15/06/15/inside-app-extensions-webkit-content-blockers-extend-user-privacy-in-ios-9-safari-9

From the page

Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.

Last year, Apple introduced App Extensions to enable third party developers to add system-wide features using a secure new architecture. This year, iOS 9 and OS X El Capitan introduce a new Content Blockers category of App Extensions, specifically targeting Safari.