Examine source code of kidcore rainbow stars

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "kidcore rainbow stars",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(234, 0, 255, 0.27)",
      "toolbar_text": "rgb(126, 52, 182)",
      "frame": "rgb(251, 33, 211)",
      "tab_background_text": "rgb(126, 52, 182)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgb(104, 40, 152)",
      "tab_line": "rgb(251, 33, 211)",
      "popup": "rgba(104, 40, 152, 0.64)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(83, 70, 156, 0)",
      "button_background_hover": "rgba(61, 42, 164, 0)",
      "frame_inactive": "rgba(66, 51, 149, 0)",
      "tab_loading": "rgb(251, 33, 211)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b1ec4df4-f955-4ce1-b25c-7f5673c84c5d}"
    }
  }
}