Examine source code of purple catin

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "purple cat",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(22, 19, 32)",
      "toolbar_text": "rgb(152, 139, 199)",
      "frame": "rgb(22, 19, 32)",
      "tab_background_text": "rgb(153, 136, 136)",
      "toolbar_field": "rgb(22, 19, 32)",
      "toolbar_field_text": "rgb(152, 139, 199)",
      "tab_line": "rgb(90, 10, 136)",
      "popup": "rgb(32, 27, 45)",
      "popup_text": "rgb(152, 139, 199)",
      "tab_loading": "rgb(90, 10, 136)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0c894eb-7290-439e-8ab9-2c58b31e908c}"
    }
  }
}