Examine source code of Winter Tree Horizon

{
  "name": "Winter Tree Horizon",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "WinterTreesH.jpg"
    },
    "colors": {
      "frame": "rgba(145, 177, 189, 0.95)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(147, 178, 191, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(200, 221, 230, 0.1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  }
}