Examine source code of Tip Calculator v6

{
  "manifest_version": 2,
  "name": "Tip Calculator",
  "description": "Calculate tips easily.",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "clipboardWrite"
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{65e80701-44d9-4f4b-a895-ae83b26b00bd}"
    }
  }
}