ちょっと前(厳密には2012年7月4日?)に Chrome Web Store Team から以下のようなメールが届きました。 Manifest_Version 1: Manifest Version 1 has been deprecated since Chrome 18, and when Chrome 21 hits stable in mid-August the Chrome Web Store will no longer accept new items with manifest_version 1. Converting to manifest_version 2 should be very simple for the majority of developers, and we encourage all developers to update their ex