Examine source code of Multicoloured Bubbles

{
  "theme": {
    "images": {
      "theme_frame": "3000x200new2.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Multicoloured Bubbles",
  "manifest_version": 2,
  "description": "I like this, did it in about 30 minutes, hope you like it too :)"
}