Examine source code of just 4 fun

{
  "theme": {
    "images": {
      "theme_frame": "fun.jpg"
    },
    "colors": {
      "frame": "#ddddde",
      "tab_background_text": "#ddddde"
    }
  },
  "version": "2.0",
  "name": "just 4 fun",
  "manifest_version": 2,
  "description": "for people who want's 2 know something about a browser :P"
}