Examine source code of Powder

{
  "name": "Zaun",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "ezgif-4-2adadd2e50.gif"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(94, 90, 219, 0.49)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(138, 234, 255, 0.53)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(94, 217, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8a52080-0a03-470f-94da-56b84b6bfbe7}"
    }
  }
}