Examine source code of Painfully white

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Just white",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(21, 21, 21)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(21, 21, 21)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(21, 21, 21)",
      "tab_line": "rgb(176, 176, 176)",
      "popup": "rgb(243, 244, 247)",
      "popup_text": "rgb(21, 21, 21)",
      "sidebar_border": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(255, 255, 255)",
      "toolbar_field_separator": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(176, 176, 176)"
    }
  }
}