Examine source code of Ubuntu 23.10

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ubuntu 23.10",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(217, 67, 4, 0.86)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(113, 22, 87)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(240, 235, 230, 0.21)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(232, 51, 8)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12f1d64e-ab8e-4307-8164-fbce6f56dace}"
    }
  }
}