Examine source code of Local Weather Checker

{
  "manifest_version": 2,
  "name": "Local Weather Checker",
  "version": "1.0",
  "description": "Local Weather Checker is a fun and useful widget that allows users to enter a city name and see the current weather in that city.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/local-logo.png"
    }
  },
  "icons": {
    "128": "images/local-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9bec4723-754b-4fce-ad83-bc93c33bff79}"
    }
  }
}