Prototype/manifest.json

{
  "name": "FTP Client",
  "description": "FTP Client Prototype",
  "version": "2",
  "manifest_version": 2,
  "app": {
    "background": {
      "scripts": ["background.js"]
    }
  },
  "minimum_chrome_version": "33",
  "sockets": { 
              "tcp": 
                  {"connect": "*"}
              },
  "permissions": [
    { 
      "fileSystem": ["write", "retainEntries", "directory"]
    },
    "storage"
    ],
  "icons": { "16": "FTPIcon.png", "128": "FTPIcon.png" }

}