Examine source code of yuuyake

{
  "name": "yuuyake",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "empty.png"
    },
    "colors": {
      "frame": "rgba(42, 27, 27, 1)",
      "tab_background_text": "rgba(201, 147, 88, 1)",
      "toolbar": "rgba(51, 34, 34, 1)",
      "bookmark_text": "rgba(239, 178, 108, 1)",
      "toolbar_field": "rgba(42, 27, 27, 1)",
      "toolbar_field_text": "rgba(239, 178, 108, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4c138c0-0a93-443b-b8bd-b79e171b6bfc}"
    }
  }
}