[behnamoh]

I think it means the links that you open in the app which are opened in a browser “layer” on top of the app. Something like when you wanna sign in to Google on iOS’ Gmail app and the pop up shows up for you to enter your username and password.

[olliej]

[edit: I re-read the text and I think this is as you say: if an app has/is a browser, then that app obviously knows your browsing history]

Nope, its extensions :)

Just using a WebView doesn't give you any safari data, and if you're using a UISafariView or whatever its called I think its basically an opaque view with limited accessible data (and the view itself is running in another process)