Examine source code of Localhost navigation

{
  "manifest_version": 2,
  "name": "Localhost navigation",
  "version": "1.0",
  "description": "Naviagte to localhost without mouse",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+H",
        "mac": "Command+Alt+H"
      },
      "description": "Navigate to localhost"
    }
  },
  "browser_action": {
    "default_popup": "prompt.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ba0cbf8-2453-4e47-95a7-b660f4d635da}"
    }
  }
}