Examine source code of Raspberry

{
  "theme": {
    "images": {
      "theme_frame": "Raspberry.jpg"
    },
    "colors": {
      "frame": "#d7bfde",
      "tab_background_text": "#d7bfde"
    }
  },
  "version": "2.0",
  "name": "Raspberry",
  "manifest_version": 2,
  "description": "Fractal "
}