Examine source code of Focused Gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Focused Gray",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(197, 197, 197)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(179, 179, 179)",
      "tab_background_text": "rgb(232, 232, 232)",
      "toolbar_field": "rgb(179, 179, 179)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 120, 19)",
      "popup": "rgb(179, 179, 179)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 120, 19)"
    }
  }
}