Examine source code of ChristGames.org

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "ChristGames.org",
  "manifest_version": 2,
  "description": "This is the official Firefox theme for <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/2adb97f06656e51023e6388881f1481511a3cbde6a172f829208ee7cc1fba941/http%3A//ChristGames.org\">ChristGames.org</a>, a Christian game design resource. We welcome everyone to walk with us through our faith journey as we learn, create, play, fellowship, believe..."
}