Examine source code of Private Indicator

{
  "author": "sea nettle studios",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "images/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb4f1d4a-4e59-4ff6-b564-7c61e8a34fef}"
    }
  },
  "description": "Visually indicate if a browser window is in private mode or not.",
  "icons": {
    "48": "images/icon.svg",
    "96": "images/icon.svg"
  },
  "manifest_version": 2,
  "name": "Private Indicator",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "version": "2.0.1"
}