Examine source code of Oak by Madonna

{
  "name": "Oak by Madonna",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "OakH.jpg"
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "frame": "#7d522c",
      "tab_background_text": "rgba(255, 252, 240, 1)",
      "bookmark_text": "rgba(255, 243, 204, 1)"
    }
  }
}