Examine source code of Weather book

{
  "manifest_version": 2,
  "name": "Weather book",
  "version": "1.0.3",
  "description": "The best way to see the weather city right in your browser. Easier than looking outside!",
  "icons": {
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "38": "img/icon38.png"
    },
    "default_title": "Weather",
    "default_popup": "popup.html"
  },
  "permissions": [
    "alarms",
    "storage",
    "*://*.timleland.com/*",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5a90a38-b466-4006-9509-86e2799a5a9e}"
    }
  }
}