Examine source code of WillyCalvo

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "WillyCalvo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(23, 89, 40)",
      "toolbar_text": "rgb(91, 96, 188)",
      "frame": "rgb(23, 89, 40)",
      "tab_background_text": "rgb(41, 47, 37)",
      "toolbar_field": "rgb(3, 15, 7)",
      "toolbar_field_text": "rgb(91, 96, 188)",
      "tab_line": "rgb(3, 11, 168)",
      "popup": "rgb(23, 89, 40)",
      "popup_text": "rgb(91, 96, 188)",
      "tab_loading": "rgb(3, 11, 168)"
    }
  }
}