Examine source code of HSR - Astral Express

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "HSR - Astral Express",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-y"
      ]
    },
    "colors": {
      "toolbar": "rgba(37, 41, 119, 0)",
      "toolbar_text": "rgb(251, 255, 184)",
      "frame": "rgb(7, 20, 37)",
      "tab_background_text": "rgb(203, 205, 244)",
      "toolbar_field": "rgba(7, 20, 37, 0.44)",
      "toolbar_field_text": "rgb(251, 255, 184)",
      "tab_line": "rgb(184, 236, 247)",
      "popup": "rgb(170, 191, 206)",
      "popup_text": "rgb(7, 20, 37)",
      "icons_attention": "rgb(71, 224, 255)",
      "ntp_background": "rgb(29, 31, 47)",
      "toolbar_field_highlight_text": "rgb(251, 255, 184)",
      "tab_loading": "rgb(184, 236, 247)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c826c94e-d17c-4cd6-8c2c-f37978cd10ae}"
    }
  }
}