Examine source code of sky.gr

{
  "theme": {
    "images": {
      "theme_frame": "11.jpg"
    },
    "colors": {
      "frame": "#8c8c8c",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "sky.gr",
  "manifest_version": 2,
  "description": "a simple but nice persona for <a href=\"https://outgoing.prod.mozaws.net/v1/1dba1cfd3919ee7d7c632ad75a509865f6c1ab4024847f66f1c6fc98ce4dd69f/http%3A//sky.gr\" rel=\"nofollow\">sky.gr</a>"
}