Examine source code of Michael Buble

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#f7f4f4"
    }
  },
  "version": "2.0",
  "name": "Michael Buble",
  "manifest_version": 2,
  "description": "Fan of Michael Buble ? Here you can choose him to dress up your browser."
}