Examine source code of freeArchers

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "freeArchers",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/d6271411550378226b0a3bc9bb21eb44af93946220ec3e9dc5c5cd4585dda230/http%3A//www.free-archers.de\" rel=\"nofollow\">www.free-archers.de</a>"
}