Examine source code of Test Theme

{
  "name": "Test Theme",
  "manifest_version": 2,
  "version": "9.0",
  "theme": {
    "images": {
      "theme_frame": "use this.png"
    },
    "colors": {
      "frame": "rgba(47, 50, 56, 1)",
      "tab_background_text": "rgba(10, 245, 218, 1)",
      "toolbar": "rgba(51, 51, 51, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(32, 34, 38, 1)",
      "toolbar_field_text": "rgba(255, 23, 124, 1)"
    }
  }
}