Examine source code of ProGamerLeagues

{
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "ProGamerLeagues",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/a80957c946f1a07756dfb7ebdf836aee51ae6e1b95dc089c53fba19459199da4/http%3A//www.progamerleagues.com\" rel=\"nofollow\">www.progamerleagues.com</a>"
}