Examine source code of Starry night

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Starry night",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(12, 47, 78)",
      "toolbar_text": "rgb(222, 245, 253)",
      "frame": "rgb(12, 18, 91)",
      "tab_background_text": "rgb(241, 224, 255)",
      "toolbar_field": "rgb(22, 72, 97)",
      "toolbar_field_text": "rgb(233, 249, 246)",
      "tab_line": "rgb(83, 124, 203)",
      "popup": "rgb(8, 45, 59)",
      "popup_text": "rgb(98, 207, 222)",
      "tab_loading": "rgb(83, 124, 203)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6dbcb11-af95-446a-a77c-3461cc4f75a4}"
    }
  }
}