Examine source code of Highway Goodbyes

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Highway Goodbyes",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(15, 80, 116, 0.81)",
      "toolbar_text": "rgb(216, 148, 255)",
      "frame": "rgb(61, 36, 109)",
      "tab_background_text": "rgb(138, 214, 229)",
      "toolbar_field": "rgb(199, 221, 245)",
      "toolbar_field_text": "rgb(158, 123, 204)",
      "tab_line": "rgba(214, 197, 53, 0.84)",
      "popup": "rgba(199, 221, 245, 0.71)",
      "popup_text": "rgb(47, 15, 116)",
      "tab_loading": "rgba(214, 197, 53, 0.84)"
    }
  }
}