Examine source code of Party Castle

{
  "manifest_version": 2,
  "version": "3.0",
  "name": "Party Castle V3",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(13, 13, 13)",
      "toolbar_text": "rgb(255, 90, 205)",
      "frame": "rgb(33, 94, 99)",
      "tab_background_text": "rgb(175, 162, 255)",
      "toolbar_field": "rgb(28, 28, 44)",
      "toolbar_field_text": "rgb(0, 255, 231)",
      "tab_line": "rgb(0, 255, 231)",
      "popup": "rgb(15, 10, 26)",
      "popup_text": "rgb(182, 243, 255)",
      "ntp_text": "rgb(175, 162, 175)",
      "popup_border": "rgb(28, 28, 44)",
      "popup_highlight_text": "rgb(15, 10, 26)",
      "popup_highlight": "rgb(0, 217, 255)",
      "tab_background_separator": "rgb(26, 26, 26)",
      "tab_loading": "rgb(0, 255, 231)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9388dce8-143a-4252-af8e-bf6152e3788c}"
    }
  }
}