Examine source code of red hell

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "red hell",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(75, 66, 66)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(20, 26, 35)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgb(5, 7, 23)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 4, 4)",
      "popup": "rgb(70, 71, 81)",
      "popup_text": "rgb(215, 226, 239)",
      "popup_border": "rgb(28, 1, 248)",
      "sidebar_border": "rgb(28, 1, 248)",
      "sidebar_text": "rgb(248, 248, 251)",
      "sidebar": "rgb(65, 63, 72)",
      "tab_loading": "rgb(184, 180, 198)",
      "tab_selected": "rgb(54, 42, 42)",
      "toolbar_field_border": "rgb(28, 1, 248)"
    }
  }
}