Examine source code of The Purple Circle

{
  "theme": {
    "images": {
      "theme_frame": "PurpleBubbles.jpg"
    },
    "colors": {
      "frame": "#e7caed",
      "tab_background_text": "#e6aaf7"
    }
  },
  "version": "2.0",
  "name": "The Purple Circle",
  "manifest_version": 2,
  "description": "A random assortment of 2D bubble like circles in different shades of purple."
}