Examine source code of Tropical splash

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Tropical splash",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(238, 238, 238, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(167, 167, 167)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 252, 217)",
      "toolbar_field_text": "rgb(0, 70, 221)",
      "tab_line": "rgb(255, 0, 157)",
      "popup": "rgb(237, 255, 208)",
      "popup_text": "rgb(0, 119, 56)",
      "ntp_background": "rgb(101, 45, 0)",
      "ntp_text": "rgb(218, 174, 255)",
      "popup_border": "rgb(101, 45, 0)",
      "tab_loading": "rgb(255, 0, 157)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a2d7b3c-402e-4fe7-b28e-091eaa9394ca}"
    }
  }
}