Examine source code of The Witcher theme game

{
  "name": "The Witcher theme",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(56, 56, 56, 0.42)",
      "bookmark_text": "rgba(214, 214, 214, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.75)",
      "toolbar_field_text": "rgba(133, 29, 29, 0.66)",
      "tab_line": "rgba(209, 65, 65, 0.81)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a9ff3843-8e1a-4078-890e-5b1618ae416e}"
    }
  }
}