Examine source code of roxo_preto

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "roxo",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(64, 24, 58)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(23, 23, 23)",
      "tab_background_text": "rgb(223, 142, 232)",
      "toolbar_field": "rgb(23, 23, 23)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(223, 142, 232)",
      "popup": "rgb(64, 24, 58)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(223, 142, 232)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{54065234-23a5-4a46-94de-8651d80d357a}"
    }
  }
}