Examine source code of Graphite Dark

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Graphite-Dark-Rim",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(64, 64, 64)",
      "toolbar_text": "rgb(212, 212, 212)",
      "frame": "rgb(44, 44, 44)",
      "tab_background_text": "rgb(190, 190, 192)",
      "toolbar_field": "rgb(51, 51, 51)",
      "toolbar_field_text": "rgb(227, 227, 229)",
      "tab_line": "rgb(204, 204, 204)",
      "popup": "rgb(50, 50, 52)",
      "popup_text": "rgb(227, 227, 229)",
      "icons": "rgb(212, 212, 212)",
      "ntp_background": "rgb(44, 44, 44)",
      "popup_border": "rgb(204, 204, 204)",
      "sidebar_border": "rgb(204, 204, 204)",
      "sidebar": "rgb(44, 44, 44)",
      "toolbar_field_border_focus": "rgb(204, 204, 204)",
      "toolbar_field_border": "rgb(204, 204, 204)",
      "tab_loading": "rgb(204, 204, 204)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74e8cb45-078c-499c-b36c-563269be6557}"
    }
  }
}