Examine source code of Colourful Clipboard

{
  "manifest_version": 3,
  "version": "4.0.3",
  "name": "Color Clipboard",
  "action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "clipboard@frati.github",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}