Examine source code of JJK Black & White

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "JJK Black & White",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center",
        "left center",
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(214, 214, 226, 0.41)",
      "toolbar_text": "rgb(8, 8, 8)",
      "frame": "rgb(68, 68, 85)",
      "tab_background_text": "rgb(10, 10, 48)",
      "toolbar_field": "rgba(114, 114, 121, 0.15)",
      "toolbar_field_text": "rgb(15, 15, 15)",
      "tab_line": "rgba(3, 85, 173, 0.76)",
      "popup": "rgb(191, 197, 210)",
      "popup_text": "rgba(52, 52, 55, 0.85)",
      "icons_attention": "rgb(187, 187, 173)",
      "ntp_background": "rgb(194, 212, 218)",
      "popup_highlight": "rgba(255, 255, 255, 0.27)",
      "tab_loading": "rgba(3, 85, 173, 0.76)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{788bdd94-48e3-4b84-9698-8177cbb4a278}"
    }
  }
}