Examine source code of Material Gray One

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Material Gray One",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(55, 71, 79)",
      "toolbar_text": "rgb(236, 239, 241)",
      "frame": "rgb(38, 50, 56)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(55, 71, 79)",
      "toolbar_field_text": "rgb(236, 239, 241)",
      "tab_line": "rgb(78, 92, 98)",
      "popup": "rgb(55, 71, 79)",
      "popup_text": "rgb(236, 239, 241)",
      "icons": "rgb(176, 190, 197)",
      "popup_border": "rgb(55, 71, 79)",
      "popup_highlight": "rgb(69, 90, 100)",
      "tab_selected": "rgb(78, 92, 98)",
      "toolbar_field_highlight": "rgb(84, 110, 122)",
      "tab_loading": "rgb(78, 92, 98)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c765f789-58dd-4176-bc42-b8029835de00}"
    }
  }
}