Examine source code of Ganyu Namecard

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ganyu Namecard Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom",
        "left bottom",
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(117, 95, 164, 0.2)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(100, 134, 199)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(250, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(230, 250, 255)",
      "popup": "rgb(107, 142, 208)",
      "popup_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(138, 165, 210)",
      "tab_selected": "rgba(0, 0, 0, 0.25)",
      "toolbar_top_separator": "rgba(169, 181, 255, 0)",
      "tab_loading": "rgb(230, 250, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b40522d6-7752-4dd5-b304-c74315da2ab3}"
    }
  }
}