Examine source code of Indian Tetris

{
  "background": {
    "scripts": [
      "files/newtabpromo_bg.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_popup": "popup.html",
    "default_title": "__MSG_appButtonDesc__"
  },
  "default_locale": "en",
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "permissions": [],
  "version": "1.0.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1e4a42ab-e8a0-4bea-b523-852d325951b9}"
    }
  }
}