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Re:Hidden “App Ops” Feature in Android 4.3 Lets You Disable ... by Zigurd on Friday July 26, 2013 @04:04PM (#6110261)
This lets you take those permissions away retrospectively. In many cases I suspect you will find it is a free app's ad network that's asking for ridiculous permissions, e.g. access to location in a flashlight app.

Google is probably reluctant to do things that "harm" competing ad networks for fear of getting sued.

Re:Hidden “App Ops” Feature in Android 4.3 Lets You Disable ... by barend on Friday July 26, 2013 @05:07PM (#6110588)
It would make little sense for the finished feature to work retrospectively; apps would just grab the bounty on first launch and then the harm is done before you can get to the settings screen. This looks more like the screen you'd go to if you change your mind about an app. I expect the primary control for this feature to be a just-in-time dialog, similar to permission popups on iOS.