Examine source code of Recent URL

{
  "manifest_version": 2,
  "name": "URL Exporter",
  "version": "1.1",
  "description": "Writes the active tab URL to a local file.",
  "permissions": [
    "tabs",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e60c6ddd-545e-4d8b-9fa7-71a74c98f150}"
    }
  }
}