Examine source code of Kyoko Sayaka Theme

{
  "manifest_version": 2,
  "version": "1.7",
  "name": "Kyoko Sayaka Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "unknown.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ]
    },
    "colors": {
      "frame": "rgba(148, 33, 71, 0)",
      "tab_background_text": "rgba(23, 66, 107, 0.81)",
      "toolbar": "rgb(172, 202, 210, 0.10)",
      "bookmark_text": "rgba(148, 55, 55, 0.88)",
      "toolbar_field": "rgba(52, 95, 102, 0.27)",
      "toolbar_field_text": "rgba(122, 13, 13, 1)",
      "button_background_active": "rgba(122, 13, 13, 1)",
      "button_background_hover": "rgba(148, 55, 55, 0.88)",
      "tab_loading": "rgba(92, 8, 8, 0.84)"
    }
  }
}