Examine source code of dark_purple_gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark_purple_gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(41, 22, 31, 0.77)",
      "toolbar_text": "rgb(187, 173, 181)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(247, 247, 247)",
      "toolbar_field": "rgba(67, 54, 64, 0.85)",
      "toolbar_field_text": "rgb(203, 191, 199)",
      "tab_line": "rgba(233, 222, 224, 0.3)",
      "popup": "rgb(70, 58, 65)",
      "popup_text": "rgb(166, 156, 162)",
      "tab_loading": "rgba(233, 222, 224, 0.3)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a897d753-7a55-4c81-958e-ecd2c6ed4102}"
    }
  }
}