Examine source code of black background rose

{
  "manifest_version": 2,
  "version": "5.0",
  "name": "black background rose",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(141, 0, 0, 0.15)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(20, 0, 0)",
      "tab_background_text": "rgb(214, 209, 211)",
      "toolbar_field": "rgba(6, 0, 0, 0.29)",
      "toolbar_field_text": "rgb(195, 21, 21)",
      "tab_line": "rgb(141, 0, 0)",
      "popup": "rgb(21, 1, 1)",
      "popup_text": "rgb(228, 221, 222)",
      "tab_loading": "rgb(141, 0, 0)"
    }
  }
}