Examine source code of Image Downloader

{
  "version": "0.1.2resigned1",
  "manifest_version": 2,
  "default_locale": "en",
  "short_name": "image-downloader",
  "name": "__MSG_chrome_extension_name__",
  "description": "__MSG_chrome_extension_description__",
  "homepage_url": "http://eccorem.com/apps/image-downloader.html",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "tabs",
    "notifications",
    "contextMenus",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "data/icons/16.png",
    "default_title": "__MSG_browser_action_title__"
  },
  "icons": {
    "16": "data/icons/16.png",
    "18": "data/icons/18.png",
    "19": "data/icons/19.png",
    "24": "data/icons/24.png",
    "32": "data/icons/32.png",
    "36": "data/icons/36.png",
    "38": "data/icons/38.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{589e6459-3d56-49b4-9b3d-6e4b7ef16940}"
    }
  }
}