Examine source code of Material You Blue Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Material You Blue Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(15, 20, 23)",
      "toolbar_text": "rgb(167, 203, 231)",
      "frame": "rgb(21, 26, 30)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(26, 32, 37)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(167, 203, 231)",
      "popup": "rgb(15, 20, 23)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(167, 203, 231)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6722489-a1b5-48f7-b35a-f4d4c90735be}"
    }
  }
}