Examine source code of cloudy sunset

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "cloudy sunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(203, 137, 126, 0.88)",
      "toolbar_text": "rgb(253, 229, 225)",
      "frame": "rgb(181, 196, 205)",
      "tab_background_text": "rgb(252, 238, 239)",
      "toolbar_field": "rgb(250, 233, 233)",
      "toolbar_field_text": "rgb(158, 109, 66)",
      "tab_line": "rgba(238, 165, 171, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(242, 147, 136)",
      "sidebar_border": "rgb(209, 155, 158)",
      "sidebar_highlight_text": "rgb(190, 56, 56)",
      "sidebar_text": "rgb(244, 233, 233)",
      "sidebar": "rgb(203, 137, 126)",
      "tab_loading": "rgba(238, 165, 171, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{001c58c8-bec2-4811-a6bd-87b0251b7674}"
    }
  }
}