Examine source code of Shu Arknights

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Shu Arknights",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(99, 101, 21, 0.41)",
      "toolbar_text": "rgb(248, 248, 251)",
      "frame": "rgb(27, 33, 90)",
      "tab_background_text": "rgb(248, 249, 252)",
      "toolbar_field": "rgba(56, 115, 101, 0.43)",
      "toolbar_field_text": "rgb(248, 249, 251)",
      "tab_line": "rgb(238, 106, 33)",
      "popup": "rgb(56, 62, 108)",
      "popup_text": "rgb(249, 249, 252)",
      "tab_loading": "rgb(238, 106, 33)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ade27395-59fa-4bc4-ad98-93b36797e2fb}"
    }
  }
}