Examine source code of Google maps tab in search

{
  "manifest_version": 2,
  "name": "Google maps tab in search",
  "version": "0.1",
  "description": "A simple Firefox add-on to bring back Google Maps tab in search results in your language.",
  "permissions": [
    "activeTab",
    "https://www.google.com/*"
  ],
  "icons": {
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{444ab39f-28cd-40e0-9d4b-94872c25e62f}"
    }
  }
}