Examine source code of Night with Stars

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Starry Night",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(16, 22, 47)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(16, 22, 47)",
      "tab_background_text": "rgb(237, 237, 237)",
      "toolbar_field": "rgba(1, 255, 207, 0.22)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 211, 1)",
      "popup": "rgb(16, 22, 47)",
      "popup_text": "rgb(232, 235, 237)",
      "frame_inactive": "rgb(255, 211, 1)",
      "toolbar_field_border": "rgb(255, 211, 1)",
      "toolbar_vertical_separator": "rgba(255, 211, 1, 0.06)",
      "tab_loading": "rgb(255, 211, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f6ec7d4-1d40-4d89-b133-a2679b31ad02}"
    }
  }
}