Examine source code of Gorou from Genshin

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gorou from Genshin",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(31, 101, 99)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(75, 75, 75)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(122, 73, 73)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(126, 116, 106)",
      "popup": "rgb(75, 69, 64)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(126, 116, 106)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{849fdb59-f882-4a6f-9be7-1a396f6ea4ae}"
    }
  }
}