Examine source code of LilDark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "LilDark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-015-79a105bb546d3dfdd686392cf3ad1f57.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(52, 49, 54)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(58, 54, 62)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(31, 31, 47, 0)",
      "toolbar_field_text": "rgb(156, 152, 241)",
      "tab_line": "rgba(156, 152, 241, 0.71)",
      "popup": "rgba(46, 46, 60, 0.97)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(156, 152, 241, 0.71)",
      "ntp_background": "rgb(162, 160, 219)",
      "ntp_text": "rgba(0, 0, 0, 0.67)",
      "popup_border": "rgba(156, 152, 241, 0.3)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(37, 36, 44)",
      "tab_selected": "rgba(156, 152, 241, 0.09)",
      "toolbar_field_focus": "rgba(30, 30, 45, 0.29)",
      "toolbar_field_highlight": "rgb(156, 152, 241)",
      "tab_loading": "rgba(156, 152, 241, 0.71)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f6e6eea-09ea-4fcf-9ec9-040158e70e67}"
    }
  }
}