Examine source code of Quick Scroll to Top

{
  "manifest_version": 2,
  "name": "Quick Scroll to Top",
  "version": "1.0",
  "description": "Quickly scroll the current page to the top.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d18a7f4b-38c4-4822-b2b9-6e6b29d01270}"
    }
  }
}