Examine source code of rainy pond

{
  "name": "frog pond",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "rainy3.png"
    },
    "colors": {
      "frame": "rgba(73, 99, 92, 1)",
      "tab_background_text": "rgba(17, 53, 49, 1)",
      "toolbar": "rgba(176, 192, 184, 0.5)",
      "bookmark_text": "rgba(17, 53, 49, 1)",
      "toolbar_field": "rgba(224, 243, 234, 1)",
      "toolbar_field_text": "rgba(17, 53, 49, 1)"
    }
  }
}