Examine source code of Firefly: Honkai Star Rail

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Firefly: Honkai Star Rail",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom",
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.1)",
      "toolbar_text": "rgb(129, 196, 203)",
      "frame": "rgb(93, 180, 224)",
      "tab_background_text": "rgb(198, 243, 255)",
      "toolbar_field": "rgba(0, 0, 0, 0.3)",
      "toolbar_field_text": "rgb(198, 243, 255)",
      "tab_line": "rgb(37, 88, 93)",
      "popup": "rgb(44, 60, 67)",
      "popup_text": "rgb(167, 217, 234)",
      "button_background_hover": "rgba(0, 0, 0, 0.5)",
      "icons": "rgb(8, 176, 221)",
      "tab_selected": "rgba(0, 0, 0, 0.5)",
      "tab_loading": "rgb(37, 88, 93)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{48161aaf-aebc-488b-97b7-e0263eb2c09b}"
    }
  }
}