Examine source code of WizardTower

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "WizardTower",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(18, 0, 33)",
      "toolbar_text": "rgb(146, 112, 22)",
      "frame": "rgb(18, 0, 33)",
      "tab_background_text": "rgb(233, 195, 87)",
      "toolbar_field": "rgb(197, 159, 10)",
      "toolbar_field_text": "rgb(58, 48, 0)",
      "tab_line": "rgb(165, 126, 5)",
      "popup": "rgb(239, 204, 34)",
      "popup_text": "rgb(133, 110, 61)",
      "button_background_active": "rgb(216, 170, 29)",
      "icons_attention": "rgb(36, 29, 3)",
      "icons": "rgb(146, 116, 22)",
      "ntp_background": "rgb(18, 0, 33)",
      "popup_border": "rgb(143, 132, 75)",
      "toolbar_field_border_focus": "rgb(224, 192, 55)",
      "toolbar_field_highlight": "rgb(161, 157, 108)",
      "tab_loading": "rgb(165, 126, 5)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a15295d2-5b46-4f00-b34e-4784208cb356}"
    }
  }
}