Examine source code of Watch

{
  "name": "1000058259",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1000058259.jpg"
    },
    "colors": {
      "frame": "rgba(224, 20, 20, 1)",
      "tab_background_text": "rgba(23, 73, 143, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_field": "rgba(3, 3, 3, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{59b7d774-afff-45d7-857e-d0540a428b48}"
    }
  }
}