Examine source code of Simple Black Geometry Art

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple Black Geometry Art",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(3, 41, 83)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(49, 66, 87)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(150, 46, 213)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(183, 19, 81)",
      "popup": "rgb(157, 20, 46)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(183, 19, 81)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{588bd8dc-2fcf-4f0b-be26-489966bedd4e}"
    }
  }
}