Examine source code of Watch

{
  "name": "Watch",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1000175606.jpg"
    },
    "colors": {
      "frame": "rgba(210, 151, 219, 1)",
      "tab_background_text": "rgba(232, 223, 51, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d0b7a14-5cfd-4b9d-aaf7-d1b8843fd77e}"
    }
  }
}