Examine source code of super cool 300

{
  "theme": {
    "images": {
      "theme_frame": "300.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#8a0000"
    }
  },
  "version": "2.0",
  "name": "super cool 300",
  "manifest_version": 2,
  "description": "this is super cool that's why it's called super cool"
}