Apple announced a series of improvement for it IOS 9, including a content blocker can kill a lot of applications similar the popular AdBlock. The content blocking is not natively available in iOS 9, but users will need to install a blocking software that interacts with Safari (via JSON) The new API will improve Adblock Plus performance on Safari or it will force us to rely upon an inferior blocking format that would essentially kill adblocking on Safari. States Sebastian Noack from AdBlock.”]
Source: http://securityaffairs.co/wordpress/37734/security/adblock-ios-9.html