Source Manifest.json {"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 2, "name": "__MSG_app_name__", "description": "__MSG_app_description__", "version": "0.1", "app": { "background": { "scripts": [ "background.js" ] } }, "permissions": [{ "fileSystem": ["write", "retainEntries", "directory"] }], "icons": { "16": "icon/icon-16.png", "32": "icon/icon-32.png", "48": "icon/icon-48.png", "128": "icon/icon-128.png" }, "default_locale": "en"} Read more