Examine source code of newjeans

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "newjeans",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(236, 244, 250)",
      "toolbar_text": "rgb(154, 199, 233)",
      "frame": "rgb(156, 199, 231)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(18, 53, 95)",
      "tab_line": "rgb(218, 246, 254)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(92, 147, 188)",
      "tab_loading": "rgb(218, 246, 254)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6e01f09-d282-4d83-882a-aeacf38a16df}"
    }
  }
}