Examine source code of Deep space field

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Deep space field",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center",
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(81, 27, 87)",
      "toolbar_text": "rgb(212, 217, 59)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(51, 223, 51)",
      "toolbar_field": "rgb(38, 31, 38)",
      "toolbar_field_text": "rgb(219, 197, 57)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(10, 49, 10)",
      "popup_text": "rgb(37, 45, 190)",
      "frame_inactive": "rgb(99, 45, 117)",
      "toolbar_top_separator": "rgb(34, 25, 77)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0565bead-074a-4b46-b879-8c26e016b4a5}"
    }
  }
}