Examine source code of Purple Dark Lights

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "classico",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(26, 18, 41)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(55, 48, 88)",
      "popup": "rgb(26, 18, 41)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(8, 8, 8)",
      "popup_border": "rgb(55, 48, 88)",
      "popup_highlight": "rgb(24, 16, 63)",
      "toolbar_bottom_separator": "rgb(26, 18, 41)",
      "toolbar_field_border_focus": "rgb(55, 48, 88)",
      "tab_loading": "rgb(55, 48, 88)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{92711ebc-449a-4aab-9f6e-447b0794b598}"
    }
  }
}