This has never happened prior to iOS9, or perhaps it's the latest version of the Amazon app but I find it extremely annoying that whenever I click on an Amazon link or want to visit the full website, the blasted app opens by default in much the same way that the You Tube app does. There don't seem to be any settings to prevent this behaviour so I've deleted the app. It's a shame because I often used it, but I like to be able to view the full website now and again too.