Examine source code of Colourful aquarelle

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Rainbow aquarelle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.25)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(232, 232, 232)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0.75)",
      "toolbar_field_text": "rgb(76, 76, 76)",
      "tab_line": "rgb(119, 119, 119)",
      "popup": "rgba(255, 241, 241, 0.5)",
      "popup_text": "rgb(0, 58, 2)",
      "ntp_background": "rgba(254, 255, 235, 0.5)",
      "ntp_text": "rgb(0, 2, 115)",
      "toolbar_field_highlight": "rgb(76, 76, 76)",
      "tab_loading": "rgb(119, 119, 119)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dea447dc-a996-4349-99dc-c28e89147da0}"
    }
  }
}