Examine source code of BubblyFun

{
  "theme": {
    "images": {
      "theme_frame": "bubblyfuntop.jpg"
    },
    "colors": {
      "frame": "#c26969",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "BubblyFun",
  "manifest_version": 2,
  "description": "Bright bubbles bouncing on a deep purple background. Not obtrusive."
}