Examine source code of simple dark old rosy

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "simple dark old rosy",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(198, 141, 152, 0.31)",
      "toolbar_text": "rgb(240, 195, 204)",
      "frame": "rgb(47, 12, 17)",
      "tab_background_text": "rgb(170, 130, 135)",
      "toolbar_field": "rgba(121, 73, 83, 0.74)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(242, 11, 73, 0.78)",
      "popup": "rgb(117, 83, 96)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgba(242, 11, 73, 0.78)"
    }
  }
}