Examine source code of Google Maps Context Menu

{
  "manifest_version": 2,
  "name": "Google Maps Context Menu",
  "version": "1.0",
  "description": "Adds a context menu item to search selected text in Google Maps.",
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Google Maps Context Menu"
  },
  "icons": {
    "32": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c7555bde-d945-4f00-bd77-d8659fb61b68}"
    }
  }
}