Examine source code of ENCOM OS Dark (COSMIC)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "ENCOM OS Dark (COSMIC)",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(19, 39, 48)",
      "toolbar_text": "rgb(106, 194, 218)",
      "frame": "rgb(3, 5, 4)",
      "tab_background_text": "rgb(222, 222, 221)",
      "toolbar_field": "rgb(3, 5, 4)",
      "toolbar_field_text": "rgb(106, 194, 218)",
      "tab_line": "rgb(36, 59, 68)",
      "popup": "rgb(17, 21, 20)",
      "popup_text": "rgb(222, 222, 221)",
      "tab_loading": "rgb(36, 59, 68)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6784b2af-5cf0-4f11-bc74-4606698dbceb}"
    }
  }
}