Examine source code of Thirty.Seconds.To.Mars

{
  "theme": {
    "images": {
      "theme_frame": "Header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Thirty.Seconds.To.Mars",
  "manifest_version": 2,
  "description": "30 Seconds To Mars - Matching Wallpaper <a href=\"https://outgoing.prod.mozaws.net/v1/6c27240348faf4b57043ae8684ad5bfe8a0fe9903c1c8e259035a831c0993999/http%3A//entertainment.desktopnexus.com/wallpaper/768548/\" rel=\"nofollow\">http://entertainment.desktopnexus.com/wallpaper/768548/</a>"
}