Examine source code of Halo Main Menu

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Halo Menu",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(19, 60, 97)",
      "toolbar_text": "rgb(67, 194, 218)",
      "frame": "rgb(15, 44, 67)",
      "tab_background_text": "rgb(24, 156, 180)",
      "toolbar_field": "rgb(49, 91, 128)",
      "toolbar_field_text": "rgb(67, 194, 218)",
      "tab_line": "rgb(67, 194, 218)",
      "popup": "rgb(7, 50, 84)",
      "popup_text": "rgb(24, 156, 180)",
      "tab_loading": "rgb(67, 194, 218)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba8efc5f-69b7-473d-9501-90d48113fdd5}"
    }
  }
}