Examine source code of 2022 YouTube Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "YouTube Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(15, 15, 15)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(15, 15, 15)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(18, 18, 18)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(18, 18, 18)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(48, 48, 48)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d9c2f2a-56ff-4504-a697-676bab3d3ee9}"
    }
  }
}