Examine source code of boom light thing

{
  "theme": {
    "images": {
      "theme_frame": "X-KH-gimplogofirefox.4.9.jpg"
    },
    "colors": {
      "frame": "#ffabab",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "boom light thing",
  "manifest_version": 2,
  "description": "yes found at flickr ..made with gimp"
}