Examine source code of Red Pluto

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Pluto",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(114, 8, 8, 0.35)",
      "toolbar_text": "rgb(255, 244, 243)",
      "frame": "rgb(32, 32, 64)",
      "tab_background_text": "rgb(211, 192, 192)",
      "toolbar_field": "rgba(221, 0, 0, 0.39)",
      "toolbar_field_text": "rgb(255, 239, 238)",
      "tab_line": "rgb(233, 0, 4)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 221, 221)",
      "tab_loading": "rgb(233, 0, 4)"
    }
  }
}