Examine source code of Las Sombras

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Las Sombras",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(7, 7, 7, 0.32)",
      "toolbar_text": "rgb(206, 206, 206)",
      "frame": "rgb(78, 78, 78)",
      "tab_background_text": "rgb(207, 207, 207)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(62, 62, 62)",
      "tab_line": "rgb(139, 139, 139)",
      "popup": "rgb(237, 237, 237)",
      "popup_text": "rgb(9, 9, 9)",
      "tab_loading": "rgb(139, 139, 139)"
    }
  }
}