Examine source code of 9003anvil

{
  "name": "9003anvil",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "anvil.gif"
    },
    "colors": {
      "frame": "rgba(42, 34, 95, 1)",
      "tab_background_text": "rgba(214, 0, 0, 1)",
      "bookmark_text": "rgba(40, 82, 199, 1)",
      "toolbar_field": "rgba(163, 86, 191, 1)",
      "toolbar_field_text": "rgba(236, 173, 237, 1)"
    }
  }
}