Examine source code of Save Image Nao

{
  "background": {
    "scripts": [
      "menus.js"
    ]
  },
  "description": "Save images to custom locations from the context menu.",
  "icons": {
    "16": "SaveImageRouter_16x16.png",
    "48": "SaveImageRouter_48x48.png",
    "128": "SaveImageRouter_128x128.png"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": false
  },
  "manifest_version": 2,
  "name": "Save Image Nao",
  "permissions": [
    "contextMenus",
    "downloads",
    "storage"
  ],
  "version": "0.0.2"
}