Examine source code of chritzel_simple.

{
  "theme": {
    "images": {
      "theme_frame": "persona_header_simple.jpg"
    },
    "colors": {
      "frame": "#f5f5f5",
      "tab_background_text": "#bdbfbf"
    }
  },
  "version": "2.0",
  "name": "chritzel_simple.",
  "manifest_version": 2,
  "description": "A simple persona based on my wallpaper \"simple.\". You can view the Wallpaper here: <a href=\"https://outgoing.prod.mozaws.net/v1/ae1c3ff5e97c16951070cc3a24df106cc112a9cd554db3195ae7ada7bfc554cc/http%3A//chritzel.deviantart.com/art/simple-143059287\" rel=\"nofollow\">http://chritzel.deviantart.com/art/simple-143059287</a>"
}