Examine source code of Vivaldi Colors

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Vivaldi Colors",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(48, 58, 80)",
      "toolbar_text": "rgb(212, 217, 227)",
      "frame": "rgb(27, 34, 52)",
      "tab_background_text": "rgb(182, 187, 197)",
      "toolbar_field": "rgb(20, 31, 51)",
      "toolbar_field_text": "rgb(159, 169, 184)",
      "tab_line": "rgb(48, 58, 80)",
      "popup": "rgb(27, 34, 52)",
      "popup_text": "rgb(197, 202, 214)",
      "tab_loading": "rgb(48, 58, 80)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fad041d6-1f35-4e89-ad84-733ec3192bd0}"
    }
  }
}