Examine source code of Lightning Overload

{
  "theme": {
    "images": {
      "theme_frame": "aniLightHeader2.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Lightning Overload",
  "manifest_version": 2,
  "description": "This is an animated persona.  Lightning bolts flash in the clouds and loops.\n\nIf your browser stopped animation, it is because you have version 18 or higher.  Download <a rel=\"nofollow\" href=\"https://addons.mozilla.org/en-US/firefox/addon/personas-shuffler/\">https://addons.mozilla.org/en-US/firefox/addon/personas-shuffler/</a> (Personas shuffler) to restore this functionality."
}