Examine source code of Material 3 theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Material 3 theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(194, 231, 255)",
      "toolbar_text": "rgb(0, 29, 53)",
      "frame": "rgb(243, 246, 252)",
      "tab_background_text": "rgb(0, 29, 53)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 29, 53)",
      "tab_line": "rgb(0, 29, 53)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 29, 53)",
      "tab_loading": "rgb(0, 29, 53)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{06e9d3fd-c820-4a8a-ab86-be15ac7e81ae}"
    }
  }
}