Examine source code of Bulk URLs Opener

{
  "name": "Bulk URL Opener",
  "version": "1.0",
  "description": "Opens multiple URLs in one click",
  "icons": {
    "128": "images/opener-removebg.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "128": "images/opener-removebg.png"
    }
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdb0502e-6482-4884-b6a5-df97795c04dc}"
    }
  }
}