Examine source code of Scroll to Top

{
  "version": "1.5.1",
  "manifest_version": 3,
  "name": "Up button",
  "description": "Adds button on every page that enables to lift the page at the top.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "up_button_@1.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_title": "Up button",
    "default_popup": "popup.html"
  },
  "icons": {
    "32": "icons/arrow 32.png",
    "48": "icons/arrow 48.png",
    "64": "icons/arrow 64.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "homepage_url": "https://github.com/lipaev/up_button"
}