Examine source code of Nordic

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nordic",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(7, 50, 84, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(28, 47, 62)",
      "tab_background_text": "rgb(204, 217, 219)",
      "toolbar_field": "rgba(38, 72, 102, 0.24)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(67, 194, 218)",
      "popup": "rgb(7, 50, 84)",
      "popup_text": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(34, 25, 77, 0)",
      "tab_loading": "rgb(67, 194, 218)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e693937f-539e-4add-b540-bcb46cb0082a}"
    }
  }
}