Examine source code of Juggler Red with Balls

{
  "theme": {
    "images": {
      "theme_frame": "Juggler-Firefox-Persona-Header-3000x200-Lab.png"
    },
    "colors": {
      "frame": "#e2dfdd",
      "tab_background_text": "#f3f2f2"
    }
  },
  "version": "2.0",
  "name": "Juggler Red with Balls",
  "manifest_version": 2,
  "description": "Juggler red background with white balls being juggled in a cascade."
}