Examine source code of Simple white black red

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple white black red",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(7, 7, 7)",
      "frame": "rgb(78, 78, 78)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(141, 141, 141)",
      "tab_line": "rgb(203, 21, 21)",
      "popup": "rgb(78, 78, 78)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(203, 21, 21)"
    }
  }
}