Examine source code of Brushed Gold matte

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Brushed Gold",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(149, 119, 40, 0.37)",
      "toolbar_text": "rgb(6, 15, 2)",
      "frame": "rgb(225, 228, 231)",
      "tab_background_text": "rgb(17, 15, 2)",
      "toolbar_field": "rgba(6, 5, 0, 0.36)",
      "toolbar_field_text": "rgb(251, 251, 248)",
      "tab_line": "rgb(248, 35, 1)",
      "popup": "rgba(36, 32, 0, 0.85)",
      "popup_text": "rgb(206, 178, 55)",
      "icons_attention": "rgb(53, 46, 85)",
      "icons": "rgb(240, 249, 32)",
      "popup_border": "rgb(126, 42, 113)",
      "popup_highlight_text": "rgb(126, 42, 113)",
      "tab_loading": "rgb(248, 35, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a8801ad-abf5-4880-b7c9-f7b4183be1ae}"
    }
  }
}