Examine source code of Blue Squares

{
  "theme": {
    "images": {
      "theme_frame": "bluewhitecheckersbottom.png"
    },
    "colors": {
      "frame": "#646dc9",
      "tab_background_text": "#565dde"
    }
  },
  "version": "2.0",
  "name": "Blue  Squares",
  "manifest_version": 2,
  "description": "I know, its bad but hey, i was bored. "
}