Examine source code of blue night them

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "blue them",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-025-ffb27cfded66d27a465aeffe41e9fe61.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(15, 16, 41)",
      "toolbar_text": "rgb(169, 184, 204)",
      "frame": "rgb(30, 32, 77)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(31, 33, 85)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(15, 16, 41)",
      "popup": "rgb(15, 16, 41)",
      "popup_text": "rgb(98, 102, 183)",
      "ntp_background": "rgb(15, 16, 41)",
      "tab_loading": "rgb(15, 16, 41)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd154f5d-4094-49d0-9480-d2d8187fb3be}"
    }
  }
}