Examine source code of Scroll To Top Button

{
  "manifest_version": 2,
  "name": "Scroll To Top Button",
  "version": "1.0.0",
  "description": "Add a button to quickly scroll to the top of any webpage.",
  "icons": {
    "48": "icons/icon.svg"
  },
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "scrolltop-a95286b21e41@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}