Examine source code of Paint Raindrops

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#1411eb",
      "tab_background_text": "#040729"
    }
  },
  "version": "2.0",
  "name": "Paint Raindrops",
  "manifest_version": 2,
  "description": "Based on an experimental Microsoft Paint drawing I made. It isn't the best, but adds a childish, somewhat Windows XP-like little air to your favorite browser, Mozilla Firefox."
}