Examine source code of GameFuture

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#24b4d4"
    }
  },
  "version": "2.0",
  "name": "GameFuture",
  "manifest_version": 2,
  "description": "for <a href=\"https://outgoing.prod.mozaws.net/v1/8c0c6a85d7c0c506da9a750df2d535e726d94af61ef54b4a394f82cfc4d8be25/http%3A//Gamefuture.de\" rel=\"nofollow\">Gamefuture.de</a>"
}