Examine source code of Apple Nebola

{
  "theme": {
    "images": {
      "theme_frame": "h_applenebula.jpg"
    },
    "colors": {
      "frame": "#e8dff0",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Apple Nebola",
  "manifest_version": 2,
  "description": "A nebula is an interstellar cloud of dust, hydrogen gas, helium gas and other ionized gases. Purple"
}