Examine source code of mozFR

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "mozFR",
  "manifest_version": 2,
  "description": "It is the mascot of the Mozilla Francophone community. Designed by Mack from Mozilla Tunisia! So, yes, it is a little plump, but it really makes you want to hug it a lot! As for its pretty rainbow-colored tail, it is precisely the symbol of Francophonie."
}