Examine source code of Better Songsterr

{
  "manifest_version": 3,
  "name": "Better Songsterr",
  "version": "1.3",
  "description": "Small improvements to the user experience of Songsterr.",
  "icons": {
    "48": "icons/48x48.png",
    "96": "icons/96x96.png"
  },
  "action": {
    "default_title": "Better Songsterr",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.songsterr.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "songsterr-popup-killer@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ]
}