Examine source code of Relaxed Sunset

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Relaxed Sunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.47)",
      "toolbar_text": "rgb(244, 251, 251)",
      "frame": "rgb(84, 93, 99)",
      "tab_background_text": "rgb(12, 12, 12)",
      "toolbar_field": "rgba(56, 53, 49, 0.69)",
      "toolbar_field_text": "rgb(244, 251, 246)",
      "tab_line": "rgba(250, 243, 243, 0)",
      "popup": "rgba(49, 44, 40, 0.81)",
      "popup_text": "rgb(247, 244, 244)",
      "button_background_hover": "rgba(180, 155, 139, 0.42)",
      "icons_attention": "rgba(245, 150, 145, 0.96)",
      "icons": "rgba(252, 246, 246, 0.96)",
      "popup_border": "rgba(27, 21, 56, 0)",
      "tab_loading": "rgba(250, 243, 243, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d3a26ba-4d46-4226-acfc-8099b2532835}"
    }
  }
}